diff --git a/cmd/syncthing/gui.go b/cmd/syncthing/gui.go
index f9d68ce9..97b02b62 100644
--- a/cmd/syncthing/gui.go
+++ b/cmd/syncthing/gui.go
@@ -343,7 +343,7 @@ func (s *apiService) Serve() {
 		s.started <- listener.Addr().String()
 	}
 
-	// Indicate successfull initial startup, to ourselves and to interested
+	// Indicate successful initial startup, to ourselves and to interested
 	// listeners (i.e. the thing that starts the browser).
 	select {
 	case <-s.startedOnce:
diff --git a/lib/fs/mtimefs_test.go b/lib/fs/mtimefs_test.go
index 57c841d4..07b4b46c 100644
--- a/lib/fs/mtimefs_test.go
+++ b/lib/fs/mtimefs_test.go
@@ -45,7 +45,7 @@ func TestMtimeFS(t *testing.T) {
 		t.Error("Should not have failed:", err)
 	}
 
-	// All of the calls were successfull, so an Lstat on them should return
+	// All of the calls were successful, so an Lstat on them should return
 	// the test timestamp.
 
 	for _, file := range []string{"testdata/exists0", "testdata/exists1", "testdata/exists2"} {
diff --git a/lib/sync/sync_test.go b/lib/sync/sync_test.go
index 14f103a2..86c431fb 100644
--- a/lib/sync/sync_test.go
+++ b/lib/sync/sync_test.go
@@ -234,7 +234,7 @@ func TestTimeoutCond(t *testing.T) {
 	// See the comments in runLocks
 
 	const (
-		// Low values to avoid being intrusive in continous testing. Can be
+		// Low values to avoid being intrusive in continuous testing. Can be
 		// increased significantly for stress testing.
 		iterations = 100
 		routines   = 10