diff --git a/openmp/runtime/src/kmp_collapse.cpp b/openmp/runtime/src/kmp_collapse.cpp
--- a/openmp/runtime/src/kmp_collapse.cpp
+++ b/openmp/runtime/src/kmp_collapse.cpp
@@ -18,6 +18,8 @@
 #include "kmp_str.h"
 #include "kmp_collapse.h"
 
+#include <cmath>
+
 #if OMPT_SUPPORT
 #include "ompt-specific.h"
 #endif