diff --git a/pkgs/build-support/fetchdarcs/nix-prefetch-darcs b/pkgs/build-support/fetchdarcs/nix-prefetch-darcs
index 9f169238d073..5277dc367ca3 100755
--- a/pkgs/build-support/fetchdarcs/nix-prefetch-darcs
+++ b/pkgs/build-support/fetchdarcs/nix-prefetch-darcs
@@ -30,7 +30,7 @@ while [ $# -gt 0 ]; do
 		  quiet=1; shift 1 ;;
 		--name)
 			name="$2"; shift 2 ;;
-		--repository)
+		--repo)
 			repository="$2"; shift 2 ;;
 		--tag)
 			tag="$2"; shift 2 ;;