diff --git a/pkgs/development/libraries/libmemcached/default.nix b/pkgs/development/libraries/libmemcached/default.nix
index 6d895290e2c2..15e642832df6 100644
--- a/pkgs/development/libraries/libmemcached/default.nix
+++ b/pkgs/development/libraries/libmemcached/default.nix
@@ -23,6 +23,8 @@ stdenv.mkDerivation rec {
   buildInputs = [ libevent ];
   propagatedBuildInputs = [ cyrus_sasl ];
 
+  NIX_CFLAGS_COMPILE = [ "-fpermissive"/*gcc7*/ ];
+
   meta = with stdenv.lib; {
     homepage = http://libmemcached.org;
     description = "Open source C/C++ client library and tools for the memcached server";