diff --git a/pkgs/build-support/fetchdarcs/builder.sh b/pkgs/build-support/fetchdarcs/builder.sh
index adc9c55939c3..bbcf59ae0885 100644
--- a/pkgs/build-support/fetchdarcs/builder.sh
+++ b/pkgs/build-support/fetchdarcs/builder.sh
@@ -1,5 +1,3 @@
-set -u
-
 tagtext=""
 tagflags=""
 # Darcs hashes are sha1 (120 bits, 40-character hex)