diff --git a/test-rebuild.sh b/test-rebuild.sh
index 09839ce..5b139ea 100755
--- a/test-rebuild.sh
+++ b/test-rebuild.sh
@@ -2,7 +2,7 @@
 
 set -e
 
-PKG=$1
+PKG=${1:-$(fedpkg gimmespec | sed -e "s/.spec//")}
 
 [ -d "$PKG" -o -f "$PKG.spec" ] || fedpkg clone -a $PKG