diff --git a/quantum/quantum.c b/quantum/quantum.c
index 63ffe207..0aecd238 100644
--- a/quantum/quantum.c
+++ b/quantum/quantum.c
@@ -33,14 +33,42 @@ static void do_code16 (uint16_t code, void (*f) (uint8_t)) {
     f(KC_RGUI);
 }
 
+static inline void qk_register_weak_mods(uint8_t kc) {
+    add_weak_mods(MOD_BIT(kc));
+    send_keyboard_report();
+}
+
+static inline void qk_unregister_weak_mods(uint8_t kc) {
+    del_weak_mods(MOD_BIT(kc));
+    send_keyboard_report();
+}
+
+static inline void qk_register_mods(uint8_t kc) {
+    add_weak_mods(MOD_BIT(kc));
+    send_keyboard_report();
+}
+
+static inline void qk_unregister_mods(uint8_t kc) {
+    del_weak_mods(MOD_BIT(kc));
+    send_keyboard_report();
+}
+
 void register_code16 (uint16_t code) {
-  do_code16 (code, register_code);
+  if (IS_MOD(code) || code == KC_NO) {
+      do_code16 (code, qk_register_mods);
+  } else {
+      do_code16 (code, qk_register_weak_mods);
+  }
   register_code (code);
 }
 
 void unregister_code16 (uint16_t code) {
   unregister_code (code);
-  do_code16 (code, unregister_code);
+  if (IS_MOD(code) || code == KC_NO) {
+      do_code16 (code, qk_unregister_mods);
+  } else {
+      do_code16 (code, qk_unregister_weak_mods);
+  }
 }
 
 __attribute__ ((weak))