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-rw-r--r--src/sp-mesh-patch.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sp-mesh-patch.h b/src/sp-mesh-patch.h
index 34bbb00d8..fe9f2d071 100644
--- a/src/sp-mesh-patch.h
+++ b/src/sp-mesh-patch.h
@@ -18,7 +18,7 @@
#include "sp-object.h"
#define SP_MESHPATCH(obj) ((SPMeshPatch*)obj)
-#define SP_IS_MESHPATCH(obj) (dynamic_cast<const SPMeshPatch*>((SPObject*)obj))
+#define SP_IS_MESHPATCH(obj) (dynamic_cast<const SPMeshPatch*>((SPObject*)obj) != NULL)
/** Gradient MeshPatch. */
class SPMeshPatch : public SPObject {