diff --git a/opencv_mat.cpp b/opencv_mat.cpp
index c9ac06e..8ba03d1 100644
--- a/opencv_mat.cpp
+++ b/opencv_mat.cpp
@@ -39,7 +39,7 @@ static inline opencv_mat_object* opencv_mat_object_get(zval *zobj TSRMLS_DC) {
         	zval *temp_prop; \
         	ZVAL_NEW_ARR(temp_prop); \
         	ZVAL_LONG(temp_prop, MEMBER); \
-        	zend_hash_update(Z_OBJPROP_P(mat_zval), PROPERTY, sizeof(PROPERTY), (void **) &temp_prop, sizeof(zval *), NULL); \
+        	zend_hash_update(Z_OBJPROP_P(mat_zval), (zend_string *)PROPERTY, temp_prop); \
     	} while(0)
 
 static void opencv_mat_object_assign_properties(zval *mat_zval TSRMLS_DC) {