diff --git a/examples/boing.c b/examples/boing.c
index ec118a3a..bc1bcfeb 100644
--- a/examples/boing.c
+++ b/examples/boing.c
@@ -26,11 +26,12 @@
  * the rendering. Suspecting a trick, they began looking around the booth for
  * a hidden computer or VCR.
  *****************************************************************************/
-
+#ifdef _WIN32
 #if defined(_MSC_VER)
  // Make MS math.h define M_PI
  #define _USE_MATH_DEFINES
 #endif
+#endif
 
 #include <stdio.h>
 #include <stdlib.h>