diff --git a/ffmpeg.c b/ffmpeg.c
index 46adb9a98d879397fd3eb77030f5e9638373829e..841c79895e24934b63cc8d7c96e561f018d42abb 100644
--- a/ffmpeg.c
+++ b/ffmpeg.c
@@ -110,6 +110,8 @@ static const OptionDef options[];
 #define MAX_STREAMS 1024    /* arbitrary sanity check value */
 #endif
 
+#define FFM_PACKET_SIZE 4096 //XXX a duplicate of the line in ffm.h
+
 static const char *last_asked_format = NULL;
 static AVFormatContext *input_files[MAX_FILES];
 static int64_t input_files_ts_offset[MAX_FILES];
diff --git a/ffserver.c b/ffserver.c
index eab8ae25ad73a1ceaa30c33786e59f96e6c9ad8c..36cd9cedbcc9205d66d3ec392fce85c2961b4eaa 100644
--- a/ffserver.c
+++ b/ffserver.c
@@ -29,6 +29,7 @@
 #include <strings.h>
 #include <stdlib.h>
 #include "libavformat/avformat.h"
+#include "libavformat/ffm.h"
 #include "libavformat/network.h"
 #include "libavformat/os_support.h"
 #include "libavformat/rtpdec.h"
diff --git a/libavformat/avformat.h b/libavformat/avformat.h
index 8e18a6131d6b63217157e44251c09f8217d060f6..5c8456f337d58dc84912c62bf68d451089f59864 100644
--- a/libavformat/avformat.h
+++ b/libavformat/avformat.h
@@ -1508,12 +1508,6 @@ int64_t parse_date(const char *datestr, int duration);
  */
 int64_t av_gettime(void);
 
-/* ffm-specific for ffserver */
-#define FFM_PACKET_SIZE 4096
-int64_t ffm_read_write_index(int fd);
-int ffm_write_write_index(int fd, int64_t pos);
-void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
-
 #if FF_API_FIND_INFO_TAG
 /**
  * @deprecated use av_find_info_tag in libavutil instead.
diff --git a/libavformat/ffm.h b/libavformat/ffm.h
index 4c088d6912a06bdab6d052580ed7b9902a9180ac..89a14a5a8883f59255af3132b77f1dde4cf6f988 100644
--- a/libavformat/ffm.h
+++ b/libavformat/ffm.h
@@ -28,6 +28,7 @@
 
 /* The FFM file is made of blocks of fixed size */
 #define FFM_HEADER_SIZE 14
+#define FFM_PACKET_SIZE 4096
 #define PACKET_ID       0x666d
 
 /* each packet contains frames (which can span several packets */
@@ -55,4 +56,8 @@ typedef struct FFMContext {
     uint8_t packet[FFM_PACKET_SIZE];
 } FFMContext;
 
+int64_t ffm_read_write_index(int fd);
+int ffm_write_write_index(int fd, int64_t pos);
+void ffm_set_write_index(AVFormatContext *s, int64_t pos, int64_t file_size);
+
 #endif /* AVFORMAT_FFM_H */