diff --git a/pkgs/development/libraries/webkit/gtk2.nix b/pkgs/development/libraries/webkit/gtk2.nix
index 5c755c193a5..0b836cd08f0 100644
--- a/pkgs/development/libraries/webkit/gtk2.nix
+++ b/pkgs/development/libraries/webkit/gtk2.nix
@@ -61,6 +61,7 @@ rec {
 
   setVars = fullDepEntry (''
     export NIX_LDFLAGS="$NIX_LDFLAGS -lXt"
+    export NIX_CFLAGS_COMPILE="$NIX_CFLAGS_COMPILE -fpermissive"
   '') ["minInit"];
 
   doReplaceUsrBin = fullDepEntry (''