diff --git a/src/bitcoin-cli.cpp b/src/bitcoin-cli.cpp
index 6f22c7049..956457365 100644
--- a/src/bitcoin-cli.cpp
+++ b/src/bitcoin-cli.cpp
@@ -94,7 +94,7 @@ static bool AppInitRPC(int argc, char* argv[])
     // Check for -testnet or -regtest parameter (BaseParams() calls are only valid after this clause)
     try {
         SelectBaseParams(ChainNameFromCommandLine());
-    } catch(std::exception &e) {
+    } catch (const std::exception& e) {
         fprintf(stderr, "Error: %s\n", e.what());
         return false;
     }
diff --git a/src/bitcoin-tx.cpp b/src/bitcoin-tx.cpp
index 3330fe5d1..48033cd8a 100644
--- a/src/bitcoin-tx.cpp
+++ b/src/bitcoin-tx.cpp
@@ -37,7 +37,7 @@ static bool AppInitRawTx(int argc, char* argv[])
     // Check for -testnet or -regtest parameter (Params() calls are only valid after this clause)
     try {
         SelectParams(ChainNameFromCommandLine());
-    } catch(std::exception &e) {
+    } catch (const std::exception& e) {
         fprintf(stderr, "Error: %s\n", e.what());
         return false;
     }
diff --git a/src/bitcoind.cpp b/src/bitcoind.cpp
index d2af89724..addf0e6a2 100644
--- a/src/bitcoind.cpp
+++ b/src/bitcoind.cpp
@@ -109,7 +109,7 @@ bool AppInit(int argc, char* argv[])
         // Check for -testnet or -regtest parameter (Params() calls are only valid after this clause)
         try {
             SelectParams(ChainNameFromCommandLine());
-        } catch(std::exception &e) {
+        } catch (const std::exception& e) {
             fprintf(stderr, "Error: %s\n", e.what());
             return false;
         }
diff --git a/src/dbwrapper.h b/src/dbwrapper.h
index aa2876750..1d31ab8ae 100644
--- a/src/dbwrapper.h
+++ b/src/dbwrapper.h
@@ -104,7 +104,7 @@ public:
         try {
             CDataStream ssKey(slKey.data(), slKey.data() + slKey.size(), SER_DISK, CLIENT_VERSION);
             ssKey >> key;
-        } catch(std::exception &e) {
+        } catch (const std::exception&) {
             return false;
         }
         return true;
@@ -120,7 +120,7 @@ public:
             CDataStream ssValue(slValue.data(), slValue.data() + slValue.size(), SER_DISK, CLIENT_VERSION);
             ssValue.Xor(*obfuscate_key);
             ssValue >> value;
-        } catch(std::exception &e) {
+        } catch (const std::exception&) {
             return false;
         }
         return true;