diff --git a/libavcodec/h263.c b/libavcodec/h263.c
index e3a3f29b02..fd1c41a399 100644
--- a/libavcodec/h263.c
+++ b/libavcodec/h263.c
@@ -1481,7 +1481,7 @@ int ff_h263_resync(MpegEncContext *s){
 
     if(show_bits(&s->gb, 16)==0){
         pos= get_bits_count(&s->gb);
-        if(s->codec_id==CODEC_ID_MPEG4)
+        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4)
             ret= mpeg4_decode_video_packet_header(s);
         else
             ret= h263_decode_gob_header(s);
@@ -1498,7 +1498,7 @@ int ff_h263_resync(MpegEncContext *s){
             GetBitContext bak= s->gb;
 
             pos= get_bits_count(&s->gb);
-            if(s->codec_id==CODEC_ID_MPEG4)
+            if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4)
                 ret= mpeg4_decode_video_packet_header(s);
             else
                 ret= h263_decode_gob_header(s);
diff --git a/libavcodec/h263dec.c b/libavcodec/h263dec.c
index d2fcabdb70..f2cb976447 100644
--- a/libavcodec/h263dec.c
+++ b/libavcodec/h263dec.c
@@ -172,7 +172,7 @@ static int decode_slice(MpegEncContext *s){
     if(s->partitioned_frame){
         const int qscale= s->qscale;
 
-        if(s->codec_id==CODEC_ID_MPEG4){
+        if(CONFIG_MPEG4_DECODER && s->codec_id==CODEC_ID_MPEG4){
             if(ff_mpeg4_decode_partitions(s) < 0)
                 return -1;
         }