diff --git a/src/chipset/intel_420ex.c b/src/chipset/intel_420ex.c
index 4d810f65b..34335d53c 100644
--- a/src/chipset/intel_420ex.c
+++ b/src/chipset/intel_420ex.c
@@ -15,6 +15,7 @@
  *
  *          Copyright 2020 Miran Grca.
  */
+#define USE_DRB_HACK
 #include <stdarg.h>
 #include <stdint.h>
 #include <stdio.h>
diff --git a/src/chipset/sis_85c496.c b/src/chipset/sis_85c496.c
index 19ecc10dd..4d1db2d9e 100644
--- a/src/chipset/sis_85c496.c
+++ b/src/chipset/sis_85c496.c
@@ -14,6 +14,7 @@
  *
  *          Copyright 2019-2020 Miran Grca.
  */
+#define USE_DRB_HACK
 #include <stdarg.h>
 #include <stdio.h>
 #include <stdint.h>