diff --git a/Applications/ApplicationsLib/TestDefinition.cpp b/Applications/ApplicationsLib/TestDefinition.cpp
index e51560b38b7313c585dfc13ef35c884e745cb96c..2ced354becfda657462f499aa2e173449499c7b2 100644
--- a/Applications/ApplicationsLib/TestDefinition.cpp
+++ b/Applications/ApplicationsLib/TestDefinition.cpp
@@ -11,6 +11,7 @@
 
 #include "TestDefinition.h"
 
+#include <cmath>
 #include <cstdlib>
 
 #include "BaseLib/ConfigTree.h"