diff --git a/pkgs/games/zandronum/default.nix b/pkgs/games/zandronum/default.nix
index 27ba69ad82b..73ce80c5f39 100644
--- a/pkgs/games/zandronum/default.nix
+++ b/pkgs/games/zandronum/default.nix
@@ -24,6 +24,8 @@ in stdenv.mkDerivation {
 
   preConfigure = ''
     ln -s ${sqlite-amalgamation}/* sqlite/
+    sed -ie 's| restrict| _restrict|g' dumb/include/dumb.h \
+                                       dumb/src/it/*.c
   '';
 
   cmakeFlags =