diff --git a/eo/src/eoParetoFitness.h b/eo/src/eoParetoFitness.h
index 37b20f7f..24ea630f 100644
--- a/eo/src/eoParetoFitness.h
+++ b/eo/src/eoParetoFitness.h
@@ -26,6 +26,7 @@
 #ifndef _eoParetoFitness_h
 #define _eoParetoFitness_h
 
+#include <math.h>
 #include <vector>
 
 /**