diff --git a/pkgs/tools/networking/haproxy/default.nix b/pkgs/tools/networking/haproxy/default.nix
index e01b62b54f1..1690d3fcc3e 100644
--- a/pkgs/tools/networking/haproxy/default.nix
+++ b/pkgs/tools/networking/haproxy/default.nix
@@ -23,7 +23,11 @@ stdenv.mkDerivation rec {
       url = "https://git.haproxy.org/?p=haproxy-1.8.git;a=patch;h=17514045e5d934dede62116216c1b016fe23dd06";
       sha256 = "0hzcvghg8qz45n3mrcgsjgvrvicvbvm52cc4hs5jbk1yb50qvls7";
     })
-  ];
+  ] ++ stdenv.lib.optional stdenv.isDarwin (fetchpatch {
+    name = "fix-darwin-no-threads-build.patch";
+    url = "https://git.haproxy.org/?p=haproxy-1.8.git;a=patch;h=fbf09c441a4e72c4a690bc7ef25d3374767fe5c5;hp=3157ef219c493f3b01192f1b809a086a5b119a1e";
+    sha256 = "16ckzb160anf7xih7mmqy59pfz8sdywmyblxnr7lz9xix3jwk55r";
+  });
 
   buildInputs = [ openssl zlib ]
     ++ stdenv.lib.optional useLua lua5_3