diff --git a/pkgs/games/dwarf-fortress/dwarf-therapist/default.nix b/pkgs/games/dwarf-fortress/dwarf-therapist/default.nix
index 9f0d5196b6d9..65eb7d497713 100644
--- a/pkgs/games/dwarf-fortress/dwarf-therapist/default.nix
+++ b/pkgs/games/dwarf-fortress/dwarf-therapist/default.nix
@@ -20,7 +20,7 @@ stdenv.mkDerivation {
   enableParallelBuilding = false;
 
   configurePhase = ''
-    qmake PREFIX=$out
+    $QMAKE PREFIX=$out
   '';
 
   # Move layout files so they cannot be found by Therapist