diff --git a/libavcodec/h264.c b/libavcodec/h264.c
index e3a71d86da..8f3e14dd5b 100644
--- a/libavcodec/h264.c
+++ b/libavcodec/h264.c
@@ -48,7 +48,6 @@
 #include "thread.h"
 #include "vdpau_internal.h"
 
-// #undef NDEBUG
 #include <assert.h>
 
 const uint16_t ff_h264_mb_sizes[4] = { 256, 384, 512, 768 };
diff --git a/libavcodec/h264_direct.c b/libavcodec/h264_direct.c
index 2d93c2ab60..477359c8ff 100644
--- a/libavcodec/h264_direct.c
+++ b/libavcodec/h264_direct.c
@@ -32,7 +32,6 @@
 #include "rectangle.h"
 #include "thread.h"
 
-//#undef NDEBUG
 #include <assert.h>
 
 
diff --git a/libavcodec/h264_ps.c b/libavcodec/h264_ps.c
index a4555455ac..03f8408f60 100644
--- a/libavcodec/h264_ps.c
+++ b/libavcodec/h264_ps.c
@@ -33,7 +33,6 @@
 #include "golomb.h"
 
 
-//#undef NDEBUG
 #include <assert.h>
 
 #define MAX_LOG2_MAX_FRAME_NUM    (12 + 4)
diff --git a/libavcodec/h264_refs.c b/libavcodec/h264_refs.c
index 8f6262a37b..7dffa9b928 100644
--- a/libavcodec/h264_refs.c
+++ b/libavcodec/h264_refs.c
@@ -31,7 +31,6 @@
 #include "h264.h"
 #include "golomb.h"
 
-//#undef NDEBUG
 #include <assert.h>
 
 #define COPY_PICTURE(dst, src) \
diff --git a/libavcodec/h264_sei.c b/libavcodec/h264_sei.c
index b1c6499e61..d5e8a4f785 100644
--- a/libavcodec/h264_sei.c
+++ b/libavcodec/h264_sei.c
@@ -30,7 +30,6 @@
 #include "h264.h"
 #include "golomb.h"
 
-//#undef NDEBUG
 #include <assert.h>
 
 static const uint8_t sei_num_clock_ts_table[9] = {