diff --git a/apps/codecs/libmad/bit.c b/apps/codecs/libmad/bit.c
index 626eb7a642..85c5baadd7 100644
--- a/apps/codecs/libmad/bit.c
+++ b/apps/codecs/libmad/bit.c
@@ -28,6 +28,7 @@
 # ifdef HAVE_LIMITS_H
 #  include <limits.h>
 # else
+#  undef  CHAR_BIT
 #  define CHAR_BIT  8
 # endif
 
diff --git a/apps/codecs/libmad/layer12.c b/apps/codecs/libmad/layer12.c
index d31a22156a..c71c005cf5 100644
--- a/apps/codecs/libmad/layer12.c
+++ b/apps/codecs/libmad/layer12.c
@@ -28,6 +28,7 @@
 # ifdef HAVE_LIMITS_H
 #  include <limits.h>
 # else
+#  undef  CHAR_BIT
 #  define CHAR_BIT  8
 # endif
 
diff --git a/apps/codecs/libmad/layer3.c b/apps/codecs/libmad/layer3.c
index 5ff3a04824..64169a7cbd 100644
--- a/apps/codecs/libmad/layer3.c
+++ b/apps/codecs/libmad/layer3.c
@@ -34,6 +34,7 @@
 # ifdef HAVE_LIMITS_H
 #  include <limits.h>
 # else
+#  undef  CHAR_BIT
 #  define CHAR_BIT  8
 # endif