diff --git a/tests/libav.regression.ref b/tests/libav.regression.ref
index 2fed4e6e88e919d2a746f88a0357c180eabfeceb..b473daecc568642e54279d1601291deb3a74d84c 100644
--- a/tests/libav.regression.ref
+++ b/tests/libav.regression.ref
@@ -44,9 +44,9 @@ b466c970d54eb254ad0f954b08535634 *./data/b-libav.dv
 2906382 ./data/b-libav.gif
 b977a4fedff90a79baf70c8e02986820 *./data/b-libav.y4m
 3801810 ./data/b-libav.y4m
-./data/b-libav%d.pgm CRC=84c09106
-./data/b-libav%d.ppm CRC=25c06ecf
-./data/b-libav%d.jpg CRC=62328baa
+./data/b-libav%02d.pgm CRC=84c09106
+./data/b-libav%02d.ppm CRC=25c06ecf
+./data/b-libav%02d.jpg CRC=62328baa
 b0a8c8063d81921db5d7c8f50a1cc454 *./data/b-libav.wav
 89132 ./data/b-libav.wav
 ./data/b-libav.wav CRC=2a09519c
diff --git a/tests/regression.sh b/tests/regression.sh
index dd0997dd62cb72b999e50f004742aeeac3031109..98b982a3b8b0dc9714e67bcf4fde023364d8f778 100755
--- a/tests/regression.sh
+++ b/tests/regression.sh
@@ -86,7 +86,7 @@ ffmpeg="../ffmpeg_g"
 tiny_psnr="./tiny_psnr"
 reffile="$2"
 benchfile="$datadir/ffmpeg.bench"
-raw_src="$3/%d.pgm"
+raw_src="$3/%02d.pgm"
 raw_dst="$datadir/out.yuv"
 raw_ref="$datadir/ref.yuv"
 pcm_src="asynth1.sw"
@@ -640,17 +640,17 @@ do_ffmpeg $file -t 1 -y -qscale 10 -f pgmyuv -i $raw_src $file
 ####################
 # image formats
 # pgm (we do not do md5 on image files yet)
-file=${outfile}libav%d.pgm
+file=${outfile}libav%02d.pgm
 $ffmpeg -t 0.5 -y -qscale 10 -f pgmyuv -i $raw_src $file
 do_ffmpeg_crc $file -i $file
 
 # ppm (we do not do md5 on image files yet)
-file=${outfile}libav%d.ppm
+file=${outfile}libav%02d.ppm
 $ffmpeg -t 0.5 -y -qscale 10 -f pgmyuv -i $raw_src $file
 do_ffmpeg_crc $file -i $file
 
 # jpeg (we do not do md5 on image files yet)
-file=${outfile}libav%d.jpg
+file=${outfile}libav%02d.jpg
 $ffmpeg -t 0.5 -y -qscale 10 -f pgmyuv -i $raw_src -flags +bitexact -dct fastint -idct simple -pix_fmt yuvj420p -f image2 $file
 do_ffmpeg_crc $file -f image2 -i $file
 
diff --git a/tests/rotozoom.c b/tests/rotozoom.c
index adbd0ae0549a548de679eefd3f96ccad3767944b..bad32995f353156c6f451f76093e06722521f00c 100644
--- a/tests/rotozoom.c
+++ b/tests/rotozoom.c
@@ -279,7 +279,7 @@ int main(int argc, char **argv)
     init_demo(argv[2]);
 
     for(i=0;i<DEFAULT_NB_PICT;i++) {
-        snprintf(buf, sizeof(buf), "%s%d.pgm", argv[1], i);
+        snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
         gen_image(i, w, h);
         pgmyuv_save(buf, w, h, rgb_tab);
     }
diff --git a/tests/test.conf b/tests/test.conf
index e57d524821081b3e0b3f74ce1b72a2c69cfd3a96..84e014c9fc1dca6d87beed13ab2a2ed2fcb9f41a 100644
--- a/tests/test.conf
+++ b/tests/test.conf
@@ -57,7 +57,7 @@ FileMaxSize 100M
 
 # Fire up ffmpeg pointing at this stream
 
-Launch -loop -bitexact -dct_algo 1 -idct_algo 2 -y -f pgmyuv -i vsynth1/%d.pgm
+Launch -loop -bitexact -dct_algo 1 -idct_algo 2 -y -f pgmyuv -i vsynth1/%02d.pgm
 acl allow localhost
 </Feed>
 
diff --git a/tests/videogen.c b/tests/videogen.c
index 0a7924301bac946d63b014a564bbf72064d0b6ad..626dd0672c8c2bc7354eaa1bf2d4300290501bb0 100644
--- a/tests/videogen.c
+++ b/tests/videogen.c
@@ -268,7 +268,7 @@ int main(int argc, char **argv)
     height = h;
 
     for(i=0;i<DEFAULT_NB_PICT;i++) {
-        snprintf(buf, sizeof(buf), "%s%d.pgm", argv[1], i);
+        snprintf(buf, sizeof(buf), "%s%02d.pgm", argv[1], i);
         gen_image(i, w, h);
         pgmyuv_save(buf, w, h, rgb_tab);
     }