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-rw-r--r--pkgs/tools/networking/ssmtp/default.nix2
1 files changed, 1 insertions, 1 deletions
diff --git a/pkgs/tools/networking/ssmtp/default.nix b/pkgs/tools/networking/ssmtp/default.nix
index 4ed0c3393bc8..81da427a52cf 100644
--- a/pkgs/tools/networking/ssmtp/default.nix
+++ b/pkgs/tools/networking/ssmtp/default.nix
@@ -36,7 +36,7 @@ stdenv.mkDerivation {
 
   buildInputs = stdenv.lib.optional tlsSupport openssl;
 
-  NIX_LDFLAGS = stdenv.lib.optional tlsSupport [ "-lcrypto" ];
+  NIX_LDFLAGS = stdenv.lib.optionalString tlsSupport "-lcrypto";
 
   meta = with stdenv.lib; {
     platforms = platforms.linux;