1 files changed, 1 insertions, 1 deletions
diff --git a/nixpkgs/pkgs/applications/version-management/rcs/default.nix b/nixpkgs/pkgs/applications/version-management/rcs/default.nix
index 862b9eacd628..3283a3c046a4 100644
--- a/nixpkgs/pkgs/applications/version-management/rcs/default.nix
+++ b/nixpkgs/pkgs/applications/version-management/rcs/default.nix
@@ -51,7 +51,7 @@ stdenv.mkDerivation rec {
     make $checkFlags check || print_logs_and_fail
   '';
 
-  NIX_CFLAGS_COMPILE = [ "-std=c99" ];
+  NIX_CFLAGS_COMPILE = "-std=c99";
 
   hardeningDisable = stdenv.lib.optional stdenv.cc.isClang "format";