diff --git a/ext/standard/array.c b/ext/standard/array.c
index 7a342ad5e2b..2b84baa320e 100644
--- a/ext/standard/array.c
+++ b/ext/standard/array.c
@@ -2314,7 +2314,7 @@ PHP_FUNCTION(array_slice)
 	}
 
 	/* Initialize returned array */
-	array_init_size(return_value, length > 0 ? (uint)length : 0);
+	array_init_size(return_value, length > 0 ? (uint32_t)length : 0);
 
 	if (length <= 0) {
 		return;