diff --git a/freeglut/freeglut/src/freeglut_init.c b/freeglut/freeglut/src/freeglut_init.c
index 99b6f20..83c02ab 100644
--- a/freeglut/freeglut/src/freeglut_init.c
+++ b/freeglut/freeglut/src/freeglut_init.c
@@ -720,7 +720,7 @@ void FGAPIENTRY glutInitDisplayString( const char* displayMode )
      * delimited by blanks or tabs.
      */
     char *token ;
-    int len = strlen ( displayMode );
+    size_t len = strlen ( displayMode );
     char *buffer = (char *)malloc ( (len+1) * sizeof(char) );
     memcpy ( buffer, displayMode, len );
     buffer[len] = '\0';
diff --git a/freeglut/freeglut/src/freeglut_main.c b/freeglut/freeglut/src/freeglut_main.c
index c49943e..1a66e1f 100644
--- a/freeglut/freeglut/src/freeglut_main.c
+++ b/freeglut/freeglut/src/freeglut_main.c
@@ -1548,7 +1548,7 @@ LRESULT CALLBACK fgWindowProc( HWND hWnd, UINT uMsg, WPARAM wParam,
 {
     SFG_Window* window;
     PAINTSTRUCT ps;
-    LONG lRet = 1;
+    LRESULT lRet = 1;
 
     FREEGLUT_INTERNAL_ERROR_EXIT_IF_NOT_INITIALISED ( "Event Handler" ) ;
 
diff --git a/freeglut/freeglut/src/freeglut_misc.c b/freeglut/freeglut/src/freeglut_misc.c
index b2b3a2c..067f0aa 100644
--- a/freeglut/freeglut/src/freeglut_misc.c
+++ b/freeglut/freeglut/src/freeglut_misc.c
@@ -47,7 +47,7 @@
 int FGAPIENTRY glutExtensionSupported( const char* extension )
 {
   const char *extensions, *start;
-  const int len = strlen( extension );
+  const size_t len = strlen( extension );
 
   /* Make sure there is a current window, and thus a current context available */
   FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutExtensionSupported" );