diff --git a/lib/checkfunctions.cpp b/lib/checkfunctions.cpp
index 2542a7f7d..dc2898266 100644
--- a/lib/checkfunctions.cpp
+++ b/lib/checkfunctions.cpp
@@ -22,6 +22,7 @@
 
 #include "checkfunctions.h"
 #include "symboldatabase.h"
+#include <cmath>
 
 //---------------------------------------------------------------------------