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-rw-r--r--pkgs/development/tools/ocaml/cppo/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/development/tools/ocaml/cppo/default.nix b/pkgs/development/tools/ocaml/cppo/default.nix
index 8aa446081b72..fc5f2e4a688b 100644
--- a/pkgs/development/tools/ocaml/cppo/default.nix
+++ b/pkgs/development/tools/ocaml/cppo/default.nix
@@ -18,7 +18,7 @@ let param =
     sha256 = "1xqldjz9risndnabvadw41fdbi5sa2hl4fnqls7j9xfbby1izbg8";
     extra = {
       createFindlibDestdir = true;
-      makeFlags = "PREFIX=$(out)";
+      makeFlags = [ "PREFIX=$(out)" ];
       preBuild = ''
         mkdir $out/bin
       '';