diff --git a/src/nmssm_twoloophiggs.cpp b/src/nmssm_twoloophiggs.cpp
index dffb4f037..a7d97e781 100644
--- a/src/nmssm_twoloophiggs.cpp
+++ b/src/nmssm_twoloophiggs.cpp
@@ -20,6 +20,7 @@
 #include "mssm_twoloophiggs.hpp"
 #include "nmssm2loop.h"
 #include "config.h"
+#include <cmath>
 #include <utility>
 
 #ifdef ENABLE_THREADS