diff --git a/stepmania/src/crypto51/cryptlib.h b/stepmania/src/crypto51/cryptlib.h
index 72b8c6d84a..75209aceb7 100644
--- a/stepmania/src/crypto51/cryptlib.h
+++ b/stepmania/src/crypto51/cryptlib.h
@@ -280,7 +280,7 @@ public:
 	}
 
 	//! to be implemented by derived classes, users should use one of the above functions instead
-	virtual bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const;
+	virtual bool GetVoidValue(const char *name, const std::type_info &valueType, void *pValue) const {sm_crash();};
 };
 
 //! namespace containing value name definitions