diff --git a/ODIN_II/SRC/multipliers.cpp b/ODIN_II/SRC/multipliers.cpp
index abff96a..1a1cca2 100644
--- a/ODIN_II/SRC/multipliers.cpp
+++ b/ODIN_II/SRC/multipliers.cpp
@@ -25,6 +25,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <algorithm>
+#include <cmath>
 #include "odin_types.h"
 #include "node_creation_library.h"
 #include "multipliers.h"