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-rw-r--r--src/sp-filter-primitive.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sp-filter-primitive.h b/src/sp-filter-primitive.h
index 1026937ff..e4dda2e06 100644
--- a/src/sp-filter-primitive.h
+++ b/src/sp-filter-primitive.h
@@ -18,7 +18,7 @@
#include "svg/svg-length.h"
#define SP_FILTER_PRIMITIVE(obj) ((SPFilterPrimitive*)obj)
-#define SP_IS_FILTER_PRIMITIVE(obj) (dynamic_cast<const SPFilterPrimitive*>((SPObject*)obj))
+#define SP_IS_FILTER_PRIMITIVE(obj) (dynamic_cast<const SPFilterPrimitive*>((SPObject*)obj) != NULL)
namespace Inkscape {
namespace Filters {