diff --git a/contrib/devtools/security-check.py b/contrib/devtools/security-check.py
index e96eaa9c3..fe5dc9ad8 100755
--- a/contrib/devtools/security-check.py
+++ b/contrib/devtools/security-check.py
@@ -1,7 +1,7 @@
 #!/usr/bin/python2
 '''
 Perform basic ELF security checks on a series of executables.
-Exit status will be 0 if succesful, and the program will be silent.
+Exit status will be 0 if successful, and the program will be silent.
 Otherwise the exit status will be 1 and it will log which executables failed which checks.
 Needs `readelf` (for ELF) and `objdump` (for PE).
 '''
diff --git a/src/torcontrol.cpp b/src/torcontrol.cpp
index 2fd20ae42..8b7702481 100644
--- a/src/torcontrol.cpp
+++ b/src/torcontrol.cpp
@@ -79,7 +79,7 @@ public:
     /**
      * Connect to a Tor control port.
      * target is address of the form host:port.
-     * connected is the handler that is called when connection is succesfully established.
+     * connected is the handler that is called when connection is successfully established.
      * disconnected is a handler that is called when the connection is broken.
      * Return true on success.
      */
@@ -177,7 +177,7 @@ void TorControlConnection::eventcb(struct bufferevent *bev, short what, void *ct
 {
     TorControlConnection *self = (TorControlConnection*)ctx;
     if (what & BEV_EVENT_CONNECTED) {
-        LogPrint("tor", "tor: Succesfully connected!\n");
+        LogPrint("tor", "tor: Successfully connected!\n");
         self->connected(*self);
     } else if (what & (BEV_EVENT_EOF|BEV_EVENT_ERROR)) {
         if (what & BEV_EVENT_ERROR)
@@ -380,7 +380,7 @@ private:
     void authchallenge_cb(TorControlConnection& conn, const TorControlReply& reply);
     /** Callback for PROTOCOLINFO result */
     void protocolinfo_cb(TorControlConnection& conn, const TorControlReply& reply);
-    /** Callback after succesful connection */
+    /** Callback after successful connection */
     void connected_cb(TorControlConnection& conn);
     /** Callback after connection lost or failed connection attempt */
     void disconnected_cb(TorControlConnection& conn);
@@ -419,7 +419,7 @@ TorController::~TorController()
 void TorController::add_onion_cb(TorControlConnection& conn, const TorControlReply& reply)
 {
     if (reply.code == 250) {
-        LogPrint("tor", "tor: ADD_ONION succesful\n");
+        LogPrint("tor", "tor: ADD_ONION successful\n");
         BOOST_FOREACH(const std::string &s, reply.lines) {
             std::map<std::string,std::string> m = ParseTorReplyMapping(s);
             std::map<std::string,std::string>::iterator i;
@@ -448,7 +448,7 @@ void TorController::add_onion_cb(TorControlConnection& conn, const TorControlRep
 void TorController::auth_cb(TorControlConnection& conn, const TorControlReply& reply)
 {
     if (reply.code == 250) {
-        LogPrint("tor", "tor: Authentication succesful\n");
+        LogPrint("tor", "tor: Authentication successful\n");
 
         // Now that we know Tor is running setup the proxy for onion addresses
         // if -onion isn't set to something else.
@@ -501,7 +501,7 @@ static std::vector<uint8_t> ComputeResponse(const std::string &key, const std::v
 void TorController::authchallenge_cb(TorControlConnection& conn, const TorControlReply& reply)
 {
     if (reply.code == 250) {
-        LogPrint("tor", "tor: SAFECOOKIE authentication challenge succesful\n");
+        LogPrint("tor", "tor: SAFECOOKIE authentication challenge successful\n");
         std::pair<std::string,std::string> l = SplitTorReplyLine(reply.lines[0]);
         if (l.first == "AUTHCHALLENGE") {
             std::map<std::string,std::string> m = ParseTorReplyMapping(l.second);