diff --git a/sys/modules/acpi/acpi/Makefile b/sys/modules/acpi/acpi/Makefile
index f5ebb278a5b4..4f45830b7373 100644
--- a/sys/modules/acpi/acpi/Makefile
+++ b/sys/modules/acpi/acpi/Makefile
@@ -79,12 +79,12 @@ DBSRC+=	dmresrcs.c dmutils.c dmwalk.c
 .if KTR
 CFLAGS+=-DKTR
 .endif
+.if ACPI_MAX_TASKS
+CFLAGS+=-DACPI_MAX_TASKS
+.endif
 .if ACPI_MAX_THREADS
 CFLAGS+=-DACPI_MAX_THREADS=${ACPI_MAX_THREADS}
 .endif
-.if ACPI_NO_SEMAPHORES
-CFLAGS+=-DACPI_NO_SEMAPHORES
-.endif
 .if ACPI_DEBUG
 CFLAGS+=-DACPI_DEBUG
 SRCS+=	${DBSRC}