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-rw-r--r--pkgs/servers/mail/postfix/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/servers/mail/postfix/default.nix b/pkgs/servers/mail/postfix/default.nix
index b3345f9420c..c0e6252a551 100644
--- a/pkgs/servers/mail/postfix/default.nix
+++ b/pkgs/servers/mail/postfix/default.nix
@@ -79,7 +79,7 @@ in stdenv.mkDerivation rec {
     make makefiles CCARGS='${ccargs}' AUXLIBS='${auxlibs}'
   '';
 
-  NIX_LDFLAGS = lib.optional withLDAP "-llber";
+  NIX_LDFLAGS = lib.optionalString withLDAP "-llber";
 
   installTargets = [ "non-interactive-package" ];