diff --git a/libavformat/movenc.c b/libavformat/movenc.c
index 892d454280..cd2d25728c 100644
--- a/libavformat/movenc.c
+++ b/libavformat/movenc.c
@@ -31,13 +31,13 @@
 #define MOV_INDEX_CLUSTER_SIZE 16384
 #define globalTimescale 1000
 
-#define MODE_MP4 0
-#define MODE_MOV 1
-#define MODE_3GP 2
-#define MODE_PSP 3 // example working PSP command line:
+#define MODE_MP4  0x01
+#define MODE_MOV  0x02
+#define MODE_3GP  0x04
+#define MODE_PSP  0x08 // example working PSP command line:
 // ffmpeg -i testinput.avi  -f psp -r 14.985 -s 320x240 -b 768 -ar 24000 -ab 32 M4V00001.MP4
-#define MODE_3G2 4
-#define MODE_IPOD 5
+#define MODE_3G2  0x10
+#define MODE_IPOD 0x20
 
 typedef struct MOVIentry {
     unsigned int flags, size;