diff --git a/libavformat/Makefile b/libavformat/Makefile
index 4b15830659..56fa96ea7f 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -122,7 +122,7 @@ OBJS-$(CONFIG_AVI_DEMUXER)               += avidec.o isom_tags.o
 OBJS-$(CONFIG_AVI_MUXER)                 += avienc.o mpegtsenc.o avlanguage.o rawutils.o
 OBJS-$(CONFIG_AVM2_MUXER)                += swfenc.o swf.o
 OBJS-$(CONFIG_AVR_DEMUXER)               += avr.o pcm.o
-OBJS-$(CONFIG_AVS_DEMUXER)               += avs.o voc_packet.o vocdec.o voc.o
+OBJS-$(CONFIG_AVS_DEMUXER)               += avs.o voc_packet.o voc.o
 OBJS-$(CONFIG_AVS2_DEMUXER)              += avs2dec.o rawdec.o
 OBJS-$(CONFIG_AVS2_MUXER)                += rawenc.o
 OBJS-$(CONFIG_AVS3_DEMUXER)              += avs3dec.o rawdec.o
@@ -137,7 +137,7 @@ OBJS-$(CONFIG_BMV_DEMUXER)               += bmv.o
 OBJS-$(CONFIG_BOA_DEMUXER)               += boadec.o
 OBJS-$(CONFIG_BFSTM_DEMUXER)             += brstm.o
 OBJS-$(CONFIG_BRSTM_DEMUXER)             += brstm.o
-OBJS-$(CONFIG_C93_DEMUXER)               += c93.o voc_packet.o vocdec.o voc.o
+OBJS-$(CONFIG_C93_DEMUXER)               += c93.o voc_packet.o voc.o
 OBJS-$(CONFIG_CAF_DEMUXER)               += cafdec.o caf.o mov_chan.o mov_esds.o
 OBJS-$(CONFIG_CAF_MUXER)                 += cafenc.o caf.o riff.o
 OBJS-$(CONFIG_CAVSVIDEO_DEMUXER)         += cavsvideodec.o rawdec.o
diff --git a/libavformat/voc.c b/libavformat/voc.c
index e4cdf8bf49..04ec0da9ba 100644
--- a/libavformat/voc.c
+++ b/libavformat/voc.c
@@ -19,10 +19,10 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "config.h"
 #include "voc.h"
 #include "internal.h"
 
-const unsigned char ff_voc_magic[21] = "Creative Voice File\x1A";
 
 const AVCodecTag ff_voc_codec_tags[] = {
     {AV_CODEC_ID_PCM_U8,        0x00},
@@ -36,4 +36,7 @@ const AVCodecTag ff_voc_codec_tags[] = {
     {AV_CODEC_ID_NONE,             0},
 };
 
+#if CONFIG_VOC_DEMUXER || CONFIG_VOC_MUXER
+const unsigned char ff_voc_magic[21] = "Creative Voice File\x1A";
 const AVCodecTag *const ff_voc_codec_tags_list[] = { ff_voc_codec_tags, NULL };
+#endif