diff --git a/retroarch.c b/retroarch.c
index 52f7be1419..c3b4977eee 100644
--- a/retroarch.c
+++ b/retroarch.c
@@ -2406,8 +2406,8 @@ static void check_turbo(void)
 
 static void check_shader_dir(void)
 {
-   static bool old_pressed_next;
-   static bool old_pressed_prev;
+   static bool old_pressed_next = false;
+   static bool old_pressed_prev = false;
    bool should_apply = false;
    bool pressed_next = false;
    bool pressed_prev = false;