diff --git a/freeglut/freeglut/progs/demos/CallbackMaker/CallbackMaker.c b/freeglut/freeglut/progs/demos/CallbackMaker/CallbackMaker.c
index e952c25..25e83dc 100644
--- a/freeglut/freeglut/progs/demos/CallbackMaker/CallbackMaker.c
+++ b/freeglut/freeglut/progs/demos/CallbackMaker/CallbackMaker.c
@@ -37,7 +37,11 @@ bitmapPrintf (const char *fmt, ...)
     va_list args;
 
     va_start(args, fmt);
+#if defined(WIN32) && !defined(__CYGWIN__)
+    (void) _vsnprintf (buf, sizeof(buf), fmt, args);
+#else
     (void) vsnprintf (buf, sizeof(buf), fmt, args);
+#endif
     va_end(args);
     glutBitmapString ( GLUT_BITMAP_HELVETICA_12, (unsigned char*)buf ) ;
 }
diff --git a/freeglut/freeglut/progs/demos/Lorenz/lorenz.c b/freeglut/freeglut/progs/demos/Lorenz/lorenz.c
index 366c7e4..6a816b2 100644
--- a/freeglut/freeglut/progs/demos/Lorenz/lorenz.c
+++ b/freeglut/freeglut/progs/demos/Lorenz/lorenz.c
@@ -249,7 +249,11 @@ void bitmapPrintf (const char *fmt, ...)
     va_list args;
 
     va_start(args, fmt);
+#if defined(WIN32) && !defined(__CYGWIN__)
+    (void) _vsnprintf (buf, sizeof(buf), fmt, args);
+#else
     (void) vsnprintf (buf, sizeof(buf), fmt, args);
+#endif
     va_end(args);
     glutBitmapString ( GLUT_BITMAP_HELVETICA_12, (unsigned char*)buf ) ;
 }
diff --git a/freeglut/freeglut/progs/demos/shapes/shapes.c b/freeglut/freeglut/progs/demos/shapes/shapes.c
index 66eb8d4..4171551 100644
--- a/freeglut/freeglut/progs/demos/shapes/shapes.c
+++ b/freeglut/freeglut/progs/demos/shapes/shapes.c
@@ -189,7 +189,11 @@ static void shapesPrintf (int row, int col, const char *fmt, ...)
     va_list args;
 
     va_start(args, fmt);
+#if defined(WIN32) && !defined(__CYGWIN__)
+    (void) _vsnprintf (buf, sizeof(buf), fmt, args);
+#else
     (void) vsnprintf (buf, sizeof(buf), fmt, args);
+#endif
     va_end(args);
 
     glGetIntegerv(GL_VIEWPORT,viewport);