diff --git a/ext/opcache/zend_shared_alloc.h b/ext/opcache/zend_shared_alloc.h
index 2ca15db86bd..0090dddf8fc 100644
--- a/ext/opcache/zend_shared_alloc.h
+++ b/ext/opcache/zend_shared_alloc.h
@@ -91,7 +91,7 @@ typedef struct _handler_entry {
 
 typedef struct _zend_shared_memory_state {
 	int *positions;   /* current positions for each segment */
-	int  shared_free; /* amount of free shared memory */
+	size_t shared_free; /* amount of free shared memory */
 } zend_shared_memory_state;
 
 typedef struct _zend_smm_shared_globals {