diff --git a/Zend/zend_call_stack.c b/Zend/zend_call_stack.c
index 2ae8c7fa1d69f..f2a752ce43786 100644
--- a/Zend/zend_call_stack.c
+++ b/Zend/zend_call_stack.c
@@ -135,7 +135,7 @@ static bool zend_call_stack_get_linux_proc_maps(zend_call_stack *stack)
 	 *                   |                   |   v
 	 * Mapping start --> |-------------------| <-- Current stack end
 	 * (adjusted         :                   :
-	 *  downards as the  .                   .
+	 *  downwards as the .                   .
 	 *  stack grows)     :                   :
 	 *                   |-------------------|
 	 *                   | Some Mapping      | The previous mapping may prevent