diff --git a/Geo/GEdgeCompound.cpp b/Geo/GEdgeCompound.cpp
index e2308abfa50b47c3a046a6ddc1b63a0ade0b167a..e617f135d3582db70c7fcc16d73b2189aadf5999 100644
--- a/Geo/GEdgeCompound.cpp
+++ b/Geo/GEdgeCompound.cpp
@@ -10,6 +10,7 @@
 #include "GmshConfig.h"
 #include "GEdgeCompound.h"
 #include "Numeric.h"
+#include "stdlib.h"
 
 GEdgeCompound::GEdgeCompound(GModel *m, int tag, std::vector<GEdge*> &compound)
   : GEdge(m, tag, 0 , 0), _compound(compound)