1 files changed, 2 insertions, 0 deletions
diff --git a/optmath.h b/optmath.h
index 3037f974..b5aa8c61 100644
--- a/optmath.h
+++ b/optmath.h
@@ -19,6 +19,8 @@
 #ifndef __OPTMATH_H
 #define __OPTMATH_H
 
+#include <math.h>
+
 #ifdef __SSE2__ // that comes from -msse2
 #define __FORCE_SSE2__
 #endif