diff --git a/3rdparty/iqa/include/iqa_os.h b/3rdparty/iqa/include/iqa_os.h
index 12aecfbac..52e0be016 100644
--- a/3rdparty/iqa/include/iqa_os.h
+++ b/3rdparty/iqa/include/iqa_os.h
@@ -43,6 +43,8 @@
 #ifdef WIN32
 
 #include <windows.h>
+#include <math.h>
+
 #define IQA_INLINE __inline
 
 #ifndef INFINITY