diff --git a/sys/contrib/dev/acpica/acfreebsd.h b/sys/contrib/dev/acpica/acfreebsd.h
index 133b128b469..53abc150e20 100644
--- a/sys/contrib/dev/acpica/acfreebsd.h
+++ b/sys/contrib/dev/acpica/acfreebsd.h
@@ -134,6 +134,7 @@
 
 #ifdef ACPI_DEBUG
 #define ACPI_DEBUG_OUTPUT	/* for backward compatibility */
+#define ACPI_DISASSEMBLER
 #endif
 
 #ifdef _KERNEL
diff --git a/sys/modules/acpi/Makefile b/sys/modules/acpi/Makefile
index 37542536263..50af6418512 100644
--- a/sys/modules/acpi/Makefile
+++ b/sys/modules/acpi/Makefile
@@ -53,7 +53,7 @@ CFLAGS+=-DACPI_MAX_THREADS=${ACPI_MAX_THREADS}
 
 # Debugging support
 .if ACPI_DEBUG
-CFLAGS+=-DACPI_DEBUG -DACPI_DISASSEMBLER
+CFLAGS+=-DACPI_DEBUG
 SRCS+=	dbcmds.c dbdisply.c dbexec.c dbfileio.c dbhistry.c
 SRCS+=	dbinput.c dbstats.c dbutils.c dbxface.c
 SRCS+=	dmbuffer.c dmnames.c dmopcode.c dmobject.c dmresrc.c dmresrcl.c