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-rw-r--r--pkgs/build-support/fetchrepoproject/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/build-support/fetchrepoproject/default.nix b/pkgs/build-support/fetchrepoproject/default.nix
index e8ec0c1f4d4..8c55db5372d 100644
--- a/pkgs/build-support/fetchrepoproject/default.nix
+++ b/pkgs/build-support/fetchrepoproject/default.nix
@@ -16,7 +16,7 @@ let
     "--depth=1"
     #TODO: fetching clone.bundle seems to fail spectacularly inside a sandbox.
     "--no-clone-bundle"
-    (optionalString (createMirror != "") "--mirror")
+    (optionalString createMirror "--mirror")
     (optionalString useArchive "--archive")
     (optionalString (repoRepoURL != "") "--repo-url=${repoRepoURL}")
     (optionalString (repoRepoRev != "") "--repo-branch=${repoRepoRev}")