diff --git a/vcg/math/base.h b/vcg/math/base.h
index a2ca912a..e721194c 100644
--- a/vcg/math/base.h
+++ b/vcg/math/base.h
@@ -165,7 +165,7 @@ namespace math {
 
 /* Some <math.h> files do not define M_PI... */
 #ifndef M_PI
-#define M_PI 3.14159265358979323846
+#define M_PI 3.14159265358979323846264338327950288
 #endif
 
 #ifndef SQRT_TWO