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-rw-r--r--pkgs/applications/version-management/fossil/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/applications/version-management/fossil/default.nix b/pkgs/applications/version-management/fossil/default.nix
index 1373e13c4147..396ed10392ca 100644
--- a/pkgs/applications/version-management/fossil/default.nix
+++ b/pkgs/applications/version-management/fossil/default.nix
@@ -27,7 +27,7 @@ stdenv.mkDerivation rec {
   preCheck = stdenv.lib.optional doCheck ''
     export TCLLIBPATH="${tcllib}/lib/tcllib${tcllib.version}"
   '';
-  configureFlags = if withJson then  "--json" else  "";
+  configureFlags = stdenv.lib.optional withJson "--json";
 
   preBuild=''
     export USER=nonexistent-but-specified-user