diff --git a/src/gmio_core/internal/fast_atof.h b/src/gmio_core/internal/fast_atof.h
index b4e6fb1..f56930f 100644
--- a/src/gmio_core/internal/fast_atof.h
+++ b/src/gmio_core/internal/fast_atof.h
@@ -13,6 +13,7 @@
 
 #include <float.h>
 #include <limits.h>
+#include <math.h>
 
 GMIO_INLINE gmio_bool_t is_local_decimal_point(char in)
 {