diff --git a/tmk_core/common/wait.h b/tmk_core/common/wait.h
index 286a36d4cae..8c4e6b0692b 100644
--- a/tmk_core/common/wait.h
+++ b/tmk_core/common/wait.h
@@ -15,7 +15,7 @@ extern "C" {
 #    include "ch.h"
 // FIXME: This doesn't compile if `NKRO_ENABLED = no`
 #    define wait_ms(ms) chSysPolledDelayX(MS2RTC(STM32_SYSCLK, ms))
-#    define wait_us(us) chSysPolledDelayX(US2RTC(STM32_SYSCLK, x))
+#    define wait_us(us) chSysPolledDelayX(US2RTC(STM32_SYSCLK, us))
 #elif defined PROTOCOL_ARM_ATSAM
 #    include "clks.h"
 #    define wait_ms(ms) CLK_delay_ms(ms)