diff --git a/tmk_core/common/action_util.c b/tmk_core/common/action_util.c
index cb4b25264..77848c092 100644
--- a/tmk_core/common/action_util.c
+++ b/tmk_core/common/action_util.c
@@ -58,9 +58,13 @@ void set_oneshot_locked_mods(int8_t mods) { oneshot_locked_mods = mods; }
 void clear_oneshot_locked_mods(void) { oneshot_locked_mods = 0; }
 #if (defined(ONESHOT_TIMEOUT) && (ONESHOT_TIMEOUT > 0))
 static int16_t oneshot_time = 0;
-inline bool has_oneshot_mods_timed_out() {
+bool has_oneshot_mods_timed_out(void) {
   return TIMER_DIFF_16(timer_read(), oneshot_time) >= ONESHOT_TIMEOUT;
 }
+#else
+bool has_oneshot_mods_timed_out(void) {
+    return false;
+}
 #endif
 #endif