diff --git a/src/ATCDCL/ATCVoice.cxx b/src/ATCDCL/ATCVoice.cxx
index 682cd24a4..e4b05b75c 100644
--- a/src/ATCDCL/ATCVoice.cxx
+++ b/src/ATCDCL/ATCVoice.cxx
@@ -151,6 +151,7 @@ unsigned char* FGATCVoice::WriteMessage(char* message, int& len, bool& dataOK) {
 	// Check for no tokens found else slScheduler can be crashed
 	if(!word) {
 		dataOK = false;
+		delete[] wdptr;
 		return(NULL);
 	}
 
@@ -170,6 +171,8 @@ unsigned char* FGATCVoice::WriteMessage(char* message, int& len, bool& dataOK) {
 			SG_LOG(SG_ATC, SG_ALERT, "Offset + length: " << wdptr[i].offset + wdptr[i].length
 			     << " exceeds rawdata size: " << rawDataSize << endl);
 			delete[] wdptr;
+			delete[] tmpbuf;
+			delete[] outbuf;
 			dataOK = false;
 			return(NULL);
 		}
diff --git a/src/GUI/dialog.hxx b/src/GUI/dialog.hxx
index fcd1ca7d3..749c355cb 100644
--- a/src/GUI/dialog.hxx
+++ b/src/GUI/dialog.hxx
@@ -21,7 +21,7 @@ using std::vector;
 #define FGCLASS_LIST          0x00000001
 #define FGCLASS_AIRPORTLIST   0x00000002
 #define FGCLASS_PROPERTYLIST  0x00000004
-class GUI_ID { public: GUI_ID(int id) : id(id) {} int id; };
+class GUI_ID { public: GUI_ID(int id) : id(id) {} virtual ~GUI_ID() {} int id; };
 
 
 
diff --git a/src/GUI/gui_funcs.cxx b/src/GUI/gui_funcs.cxx
index 574611196..1dc5db7a4 100644
--- a/src/GUI/gui_funcs.cxx
+++ b/src/GUI/gui_funcs.cxx
@@ -246,6 +246,7 @@ void fgHiResDump()
     /* allocate buffer large enough to store one tile */
     GLubyte *tile = (GLubyte *)malloc(width * height * 3 * sizeof(GLubyte));
     if (!tile) {
+        delete [] filename;
         printf("Malloc of tile buffer failed!\n");
         return;
     }
@@ -257,6 +258,7 @@ void fgHiResDump()
     GLubyte *buffer
         = (GLubyte *)malloc(imageWidth * height * 3 * sizeof(GLubyte));
     if (!buffer) {
+        delete [] filename;
         free(tile);
         printf("Malloc of tile row buffer failed!\n");
         return;
@@ -283,6 +285,7 @@ void fgHiResDump()
     f = fopen(filename, "wb");
     if (!f) {
         printf("Couldn't open image file: %s\n", filename);
+        delete [] filename;
         free(buffer);
         free(tile);
         return;
diff --git a/src/Input/fgjs.cxx b/src/Input/fgjs.cxx
index 81c4cdda0..5527514d5 100644
--- a/src/Input/fgjs.cxx
+++ b/src/Input/fgjs.cxx
@@ -211,6 +211,7 @@ int main( int argc, char *argv[] ) {
     delete jsi;
     delete[] xfs;
     delete jss;
+    delete[] jstree;
 
     return 1;
 }
diff --git a/src/Instrumentation/od_gauge.hxx b/src/Instrumentation/od_gauge.hxx
index 2c957d429..3b3217d5b 100644
--- a/src/Instrumentation/od_gauge.hxx
+++ b/src/Instrumentation/od_gauge.hxx
@@ -38,7 +38,7 @@ class FGODGauge : public SGSubsystem {
 public:
     FGODGauge ( SGPropertyNode *node );
     FGODGauge();
-    ~FGODGauge();
+    virtual ~FGODGauge();
     virtual void init ();
     virtual void update (double dt);