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-rw-r--r--src/sp-filter.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/sp-filter.h b/src/sp-filter.h
index 29f1fb9f2..0d087c5bf 100644
--- a/src/sp-filter.h
+++ b/src/sp-filter.h
@@ -21,7 +21,7 @@
#include <glibmm/ustring.h>
-#define SP_FILTER(obj) ((SPFilter*)obj)
+#define SP_FILTER(obj) (dynamic_cast<SPFilter*>((SPObject*)obj))
#define SP_IS_FILTER(obj) (dynamic_cast<const SPFilter*>((SPObject*)obj) != NULL)
#define SP_FILTER_FILTER_UNITS(f) (SP_FILTER(f)->filterUnits)