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-rw-r--r--lib/types.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/lib/types.nix b/lib/types.nix
index 17c1688fa..45c009893 100644
--- a/lib/types.nix
+++ b/lib/types.nix
@@ -539,7 +539,7 @@ rec {
# POSIX.1‐2013, 3.278 Portable Filename Character Set
filename = mkOptionType {
name = "POSIX filename";
- check = test "([0-9A-Za-z._])[0-9A-Za-z._-]*";
+ check = test "[0-9A-Za-z._][0-9A-Za-z._-]*";
merge = mergeOneOption;
};