diff --git a/Zend/zend_call_stack.c b/Zend/zend_call_stack.c
index ac12b8b7d871..ab00781b47dc 100644
--- a/Zend/zend_call_stack.c
+++ b/Zend/zend_call_stack.c
@@ -591,11 +591,13 @@ static bool zend_call_stack_get_netbsd_pthread(zend_call_stack *stack)
 
 	error = pthread_attr_getstack(&attr, &addr, &max_size);
 	if (error) {
+		pthread_attr_destroy(&attr);
 		return false;
 	}
 
 	error = pthread_attr_getguardsize(&attr, &guard_size);
 	if (error) {
+		pthread_attr_destroy(&attr);
 		return false;
 	}
 
@@ -605,6 +607,7 @@ static bool zend_call_stack_get_netbsd_pthread(zend_call_stack *stack)
 	stack->base = (char *)addr + max_size;
 	stack->max_size = max_size;
 
+	pthread_attr_destroy(&attr);
 	return true;
 }
 # else