diff --git a/libavformat/Makefile b/libavformat/Makefile
index ba64be93ed..addaf30b00 100644
--- a/libavformat/Makefile
+++ b/libavformat/Makefile
@@ -32,7 +32,7 @@ OBJS-$(CONFIG_AVI_MUXER)                 += avienc.o riff.o
 OBJS-$(CONFIG_AVISYNTH)                  += avisynth.o
 OBJS-$(CONFIG_AVS_DEMUXER)               += avs.o vocdec.o voc.o riff.o
 OBJS-$(CONFIG_BETHSOFTVID_DEMUXER)       += bethsoftvid.o
-OBJS-$(CONFIG_C93_DEMUXER)               += c93.o
+OBJS-$(CONFIG_C93_DEMUXER)               += c93.o vocdec.o voc.o
 OBJS-$(CONFIG_CRC_MUXER)                 += crc.o
 OBJS-$(CONFIG_DAUD_DEMUXER)              += daud.o
 OBJS-$(CONFIG_DC1394_DEMUXER)            += dc1394.o