diff --git a/ext/opcache/Optimizer/zend_optimizer_internal.h b/ext/opcache/Optimizer/zend_optimizer_internal.h
index 0097496df9a..a9bad01be3b 100644
--- a/ext/opcache/Optimizer/zend_optimizer_internal.h
+++ b/ext/opcache/Optimizer/zend_optimizer_internal.h
@@ -26,7 +26,7 @@
 
 #if ZEND_EXTENSION_API_NO > PHP_5_4_X_API_NO
 # define VAR_NUM(v) ((zend_uint)(EX_TMP_VAR_NUM(0, 0) - EX_TMP_VAR(0, v)))
-# define NUM_VAR(v) ((zend_uint)EX_TMP_VAR_NUM(0, v))
+# define NUM_VAR(v) ((zend_uint)(zend_uintptr_t)EX_TMP_VAR_NUM(0, v))
 #else
 # define VAR_NUM(v) ((v)/(sizeof(temp_variable)))
 # define NUM_VAR(v) ((v)*(sizeof(temp_variable)))