diff --git a/include/libopencm3/efm32/lg/acmp.h b/include/libopencm3/efm32/lg/acmp.h
index 1a57cb02..0e41ef9a 100644
--- a/include/libopencm3/efm32/lg/acmp.h
+++ b/include/libopencm3/efm32/lg/acmp.h
@@ -61,7 +61,7 @@
 #define ACMP_CTRL_HYSTSEL_MASK		(0x7 << ACMP_CTRL_HYSTSEL_SHIFT)
 #define ACMP_CTRL_HYSTSEL(v)		\
 	(((v) << ACMP_CTRL_HYSTSEL_SHIFT) & ACMP_CTRL_HYSTSEL_MASK)
-#define ACMP_CTRL_HYSTSEL_HYSTx(x)	ACMP_CTRL_HYSTSEL_HYST(x)
+#define ACMP_CTRL_HYSTSEL_HYSTx(x)	ACMP_CTRL_HYSTSEL(x)
 #define ACMP_CTRL_HYSTSEL_HYST0		ACMP_CTRL_HYSTSEL_HYSTx(0)
 #define ACMP_CTRL_HYSTSEL_HYST1		ACMP_CTRL_HYSTSEL_HYSTx(1)
 #define ACMP_CTRL_HYSTSEL_HYST2		ACMP_CTRL_HYSTSEL_HYSTx(2)