diff --git a/src/sprite.cpp b/src/sprite.cpp
index 26eb297..f4c8f89 100644
--- a/src/sprite.cpp
+++ b/src/sprite.cpp
@@ -35,6 +35,9 @@
 #include "quadarray.h"
 
 #include <math.h>
+#ifndef M_PI
+# define M_PI 3.14159265358979323846
+#endif
 
 #include <SDL_rect.h>