diff --git a/source/gameengine/Converter/BL_MeshDeformer.cpp b/source/gameengine/Converter/BL_MeshDeformer.cpp
index 80112346c72..b6a59774636 100644
--- a/source/gameengine/Converter/BL_MeshDeformer.cpp
+++ b/source/gameengine/Converter/BL_MeshDeformer.cpp
@@ -47,6 +47,7 @@
 
 #include "GEN_Map.h"
 #include "STR_HashedString.h"
+#include "BLI_arithb.h"
 
 bool BL_MeshDeformer::Apply(RAS_IPolyMaterial*)
 {
@@ -166,6 +167,7 @@ void BL_MeshDeformer::RecalcNormals()
 				fnor[0]= n1[1]*n2[2] - n1[2]*n2[1];
 				fnor[1]= n1[2]*n2[0] - n1[0]*n2[2];
 				fnor[2]= n1[0]*n2[1] - n1[1]*n2[0];
+				Normalize(fnor);
 
 				/* add to vertices for smooth normals */
 				float *vn1 = m_transnors[v1.getOrigIndex()];