diff --git a/hg2git.sh b/hg2git.sh
index c51c1d5..ea25f9a 100755
--- a/hg2git.sh
+++ b/hg2git.sh
@@ -67,7 +67,7 @@ rm -rf "$GIT_DIR/$PFX-$SFX_MARKS.old" "$GIT_DIR/$PFX-$SFX_MARKS.tmp"
 
 # save SHA1s of current heads for incremental imports
 # and connectivity (plus sanity checking)
-for head in `ls "$GIT_DIR/refs/heads"` ; do
+for head in `git branch | sed 's#^..##'` ; do
   id="`git-rev-parse $head`"
   echo ":$head $id"
 done > "$GIT_DIR/$PFX-$SFX_HEADS"