diff --git a/Base/ASBaseDefines.h b/Base/ASBaseDefines.h
index 4d0fd5d5ca..88cc188130 100755
--- a/Base/ASBaseDefines.h
+++ b/Base/ASBaseDefines.h
@@ -182,3 +182,6 @@
 #endif
 
 #define ASOVERLOADABLE __attribute__((overloadable))
+
+/// Ensure that class is of certain kind
+#define ASDynamicCast(x, c) ((c *) ([x isKindOfClass:[c class]] ? x : nil))