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-rw-r--r--pkgs/development/compilers/vala/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/compilers/vala/default.nix b/pkgs/development/compilers/vala/default.nix
index bd001d5a10e8..8f93a6746ea2 100644
--- a/pkgs/development/compilers/vala/default.nix
+++ b/pkgs/development/compilers/vala/default.nix
@@ -69,7 +69,7 @@ let
     # so that it can be used to regenerate documentation.
     patches        = lib.optionals disableGraphviz [ graphvizPatch ./gvc-compat.patch ];
     configureFlags = lib.optional  disableGraphviz "--disable-graphviz";
-    preBuild       = lib.optional  disableGraphviz "buildFlagsArray+=(\"VALAC=$(pwd)/compiler/valac\")";
+    preBuild       = lib.optionalString disableGraphviz "buildFlagsArray+=(\"VALAC=$(pwd)/compiler/valac\")";
 
     outputs = [ "out" "devdoc" ];