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-rw-r--r--pkgs/servers/nosql/mongodb/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/servers/nosql/mongodb/default.nix b/pkgs/servers/nosql/mongodb/default.nix
index 4c4ac4c5cb6..c2ae83f3e8a 100644
--- a/pkgs/servers/nosql/mongodb/default.nix
+++ b/pkgs/servers/nosql/mongodb/default.nix
@@ -66,7 +66,7 @@ in stdenv.mkDerivation {
       --replace 'engine("wiredTiger")' 'engine("mmapv1")'
   '';
 
-  NIX_CFLAGS_COMPILE = stdenv.lib.optional stdenv.cc.isClang "-Wno-unused-command-line-argument";
+  NIX_CFLAGS_COMPILE = stdenv.lib.optionalString stdenv.cc.isClang "-Wno-unused-command-line-argument";
 
   sconsFlags = [
     "--release"