diff --git a/programs/native/system/src/lib.rs b/programs/native/system/src/lib.rs
index e91a3de51d..7745efedb9 100644
--- a/programs/native/system/src/lib.rs
+++ b/programs/native/system/src/lib.rs
@@ -59,7 +59,6 @@ pub fn entrypoint(
                 keyed_accounts[to].account.owner = program_id;
                 keyed_accounts[to].account.userdata = vec![0; space as usize];
                 keyed_accounts[to].account.executable = false;
-                keyed_accounts[to].account.loader = Pubkey::default();
             }
             SystemInstruction::Assign { program_id } => {
                 if !system_program::check_id(&keyed_accounts[from].account.owner) {
@@ -83,11 +82,10 @@ pub fn entrypoint(
             }
             SystemInstruction::Spawn => {
                 if !keyed_accounts[from].account.executable
-                    || keyed_accounts[from].account.loader != Pubkey::default()
+                    || keyed_accounts[from].account.owner != Pubkey::default()
                 {
                     Err(ProgramError::AccountNotFinalized)?;
                 }
-                keyed_accounts[from].account.loader = keyed_accounts[from].account.owner;
                 keyed_accounts[from].account.owner = *keyed_accounts[from].signer_key().unwrap();
             }
         }
diff --git a/sdk/src/account.rs b/sdk/src/account.rs
index 480c47672a..b721613637 100644
--- a/sdk/src/account.rs
+++ b/sdk/src/account.rs
@@ -8,13 +8,10 @@ pub struct Account {
     pub tokens: u64,
     /// data held in this account
     pub userdata: Vec<u8>,
-    /// the program that owns this account
+    /// the program that owns this account. If executable, the program that loads this account.
     pub owner: Pubkey,
     /// this account's userdata contains a loaded program (and is now read-only)
     pub executable: bool,
-    /// the loader for this account
-    /// (Pubkey::default() if the account is not executable and thus was never 'loaded')
-    pub loader: Pubkey,
 }
 
 impl Account {
@@ -25,7 +22,6 @@ impl Account {
             userdata: vec![0u8; space],
             owner,
             executable: false,
-            loader: Pubkey::default(),
         }
     }
 }
diff --git a/sdk/src/native_loader.rs b/sdk/src/native_loader.rs
index a1c0abec57..d25796050b 100644
--- a/sdk/src/native_loader.rs
+++ b/sdk/src/native_loader.rs
@@ -20,6 +20,5 @@ pub fn create_program_account(name: &str) -> Account {
         owner: id(),
         userdata: name.as_bytes().to_vec(),
         executable: true,
-        loader: id(),
     }
 }
diff --git a/src/accounts.rs b/src/accounts.rs
index b1f1791c77..b0670289b9 100644
--- a/src/accounts.rs
+++ b/src/accounts.rs
@@ -192,7 +192,7 @@ impl AccountsDB {
                     return Err(BankError::AccountNotFound);
                 }
             };
-            if !program.executable || program.loader == Pubkey::default() {
+            if !program.executable || program.owner == Pubkey::default() {
                 error_counters.account_not_found += 1;
                 return Err(BankError::AccountNotFound);
             }
@@ -200,7 +200,7 @@ impl AccountsDB {
             // add loader to chain
             accounts.insert(0, (program_id, program.clone()));
 
-            program_id = program.loader;
+            program_id = program.owner;
         }
         Ok(accounts)
     }
@@ -616,32 +616,32 @@ mod tests {
 
         let mut account = Account::new(40, 1, Pubkey::default());
         account.executable = true;
-        account.loader = native_loader::id();
+        account.owner = native_loader::id();
         accounts.push((key1, account));
 
         let mut account = Account::new(41, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key1;
+        account.owner = key1;
         accounts.push((key2, account));
 
         let mut account = Account::new(42, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key2;
+        account.owner = key2;
         accounts.push((key3, account));
 
         let mut account = Account::new(43, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key3;
+        account.owner = key3;
         accounts.push((key4, account));
 
         let mut account = Account::new(44, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key4;
+        account.owner = key4;
         accounts.push((key5, account));
 
         let mut account = Account::new(45, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key5;
+        account.owner = key5;
         accounts.push((key6, account));
 
         let instructions = vec![Instruction::new(0, &(), vec![0])];
@@ -675,7 +675,7 @@ mod tests {
 
         let mut account = Account::new(40, 1, Pubkey::default());
         account.executable = true;
-        account.loader = Pubkey::default();
+        account.owner = Pubkey::default();
         accounts.push((key1, account));
 
         let instructions = vec![Instruction::new(0, &(), vec![0])];
@@ -708,7 +708,7 @@ mod tests {
         accounts.push((key0, account));
 
         let mut account = Account::new(40, 1, Pubkey::default());
-        account.loader = native_loader::id();
+        account.owner = native_loader::id();
         accounts.push((key1, account));
 
         let instructions = vec![Instruction::new(0, &(), vec![0])];
@@ -744,17 +744,17 @@ mod tests {
 
         let mut account = Account::new(40, 1, Pubkey::default());
         account.executable = true;
-        account.loader = native_loader::id();
+        account.owner = native_loader::id();
         accounts.push((key1, account));
 
         let mut account = Account::new(41, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key1;
+        account.owner = key1;
         accounts.push((key2, account));
 
         let mut account = Account::new(42, 1, Pubkey::default());
         account.executable = true;
-        account.loader = key2;
+        account.owner = key2;
         accounts.push((key3, account));
 
         let instructions = vec![
diff --git a/src/bank.rs b/src/bank.rs
index 9c30c78d3e..042480c853 100644
--- a/src/bank.rs
+++ b/src/bank.rs
@@ -191,7 +191,6 @@ impl Bank {
             userdata: vec![0; vote_program::get_max_size() as usize],
             owner: vote_program::id(),
             executable: false,
-            loader: Pubkey::default(),
         };
 
         let mut vote_state = vote_program::VoteState::new(
diff --git a/src/rpc.rs b/src/rpc.rs
index 85a7705071..af99301215 100644
--- a/src/rpc.rs
+++ b/src/rpc.rs
@@ -599,8 +599,7 @@ mod tests {
                 "owner": [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],
                 "tokens": 20,
                 "userdata": [],
-                "executable": false,
-                "loader": [0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]
+                "executable": false
             },
             "id":1}
         "#;
diff --git a/src/rpc_pubsub.rs b/src/rpc_pubsub.rs
index a1b05e96c6..bb29fbaa34 100644
--- a/src/rpc_pubsub.rs
+++ b/src/rpc_pubsub.rs
@@ -507,7 +507,6 @@ mod tests {
         let contract_funds = Keypair::new();
         let contract_state = Keypair::new();
         let budget_program_id = budget_program::id();
-        let loader = Pubkey::default(); // TODO
         let executable = false; // TODO
         let bank = Bank::new(&genesis_block);
         let arc_bank = Arc::new(bank);
@@ -565,7 +564,6 @@ mod tests {
                    "tokens": 1,
                    "userdata": expected_userdata,
                    "executable": executable,
-                   "loader": loader,
 
                },
                "subscription": 0,
@@ -605,7 +603,6 @@ mod tests {
                    "tokens": 51,
                    "userdata": expected_userdata,
                     "executable": executable,
-                   "loader": loader,
                },
                "subscription": 0,
            }
@@ -644,7 +641,6 @@ mod tests {
                    "tokens": 1,
                    "userdata": expected_userdata,
                     "executable": executable,
-                   "loader": loader,
                },
                "subscription": 0,
            }
@@ -736,7 +732,7 @@ mod tests {
         subscriptions.check_account(&alice.pubkey(), &account);
         let string = transport_receiver.poll();
         if let Async::Ready(Some(response)) = string.unwrap() {
-            let expected = format!(r#"{{"jsonrpc":"2.0","method":"accountNotification","params":{{"result":{{"executable":false,"loader":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"owner":[129,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"tokens":1,"userdata":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}},"subscription":0}}}}"#);
+            let expected = format!(r#"{{"jsonrpc":"2.0","method":"accountNotification","params":{{"result":{{"executable":false,"owner":[129,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0],"tokens":1,"userdata":[0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0]}},"subscription":0}}}}"#);
             assert_eq!(expected, response);
         }