diff --git a/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix b/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix
index f86ef4bea7ab..6e3a13692a72 100644
--- a/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix
+++ b/pkgs/games/dwarf-fortress/dwarf-therapist/wrapper.nix
@@ -30,11 +30,17 @@ in symlinkJoin {
     # Fix up memory layouts
     rm -rf $out/share/dwarftherapist/memory_layouts/linux
     mkdir -p $out/share/dwarftherapist/memory_layouts/linux
-    origmd5=$(cat "${dwarf-fortress}/hash.md5.orig" | cut -c1-8)
-    patchedmd5=$(cat "${dwarf-fortress}/hash.md5" | cut -c1-8)
-    substitute \
-      ${dwarf-therapist}/share/dwarftherapist/memory_layouts/${inifile} \
-      $out/share/dwarftherapist/memory_layouts/${inifile} \
-      --replace "$origmd5" "$patchedmd5"
+    orig_md5=$(cat "${dwarf-fortress}/hash.md5.orig" | cut -c1-8)
+    patched_md5=$(cat "${dwarf-fortress}/hash.md5" | cut -c1-8)
+    input_file="${dwarf-therapist}/share/dwarftherapist/memory_layouts/${inifile}"
+    output_file="$out/share/dwarftherapist/memory_layouts/${inifile}"
+
+    echo "[Dwarf Therapist Wrapper] Fixing Dwarf Fortress MD5 prefix:"
+    echo "  Input:   $input_file"
+    echo "  Search:  $orig_md5"
+    echo "  Output:  $output_file"
+    echo "  Replace: $patched_md5"
+
+    substitute "$input_file" "$output_file" --replace "$orig_md5" "$patched_md5"
   '';
 }
diff --git a/pkgs/games/dwarf-fortress/wrapper/default.nix b/pkgs/games/dwarf-fortress/wrapper/default.nix
index 105143916d10..33523270b19d 100644
--- a/pkgs/games/dwarf-fortress/wrapper/default.nix
+++ b/pkgs/games/dwarf-fortress/wrapper/default.nix
@@ -37,6 +37,39 @@ let
 
     paths = themePkg ++ pkgs;
     pathsToLink = [ "/" "/hack" "/hack/scripts" ];
+
+    postBuild = ''
+      # De-symlink init.txt
+      cp $out/data/init/init.txt init.txt
+      rm -f $out/data/init/init.txt
+      mv init.txt $out/data/init/init.txt
+    '' + lib.optionalString enableDFHack ''
+      # De-symlink symbols.xml
+      rm $out/hack/symbols.xml
+
+      # Patch the MD5
+      orig_md5=$(cat "${dwarf-fortress}/hash.md5.orig")
+      patched_md5=$(cat "${dwarf-fortress}/hash.md5")
+      input_file="${dfhack_}/hack/symbols.xml"
+      output_file="$out/hack/symbols.xml"
+
+      echo "[DFHack Wrapper] Fixing Dwarf Fortress MD5:"
+      echo "  Input:   $input_file"
+      echo "  Search:  $orig_md5"
+      echo "  Output:  $output_file"
+      echo "  Replace: $patched_md5"
+
+      substitute "$input_file" "$output_file" --replace "$orig_md5" "$patched_md5"
+    '' + lib.optionalString enableTWBT ''
+      substituteInPlace $out/data/init/init.txt \
+        --replace '[PRINT_MODE:2D]' '[PRINT_MODE:TWBT]'
+    '' + ''
+      substituteInPlace $out/data/init/init.txt \
+        --replace '[INTRO:YES]' '[INTRO:${unBool enableIntro}]' \
+        --replace '[TRUETYPE:YES]' '[TRUETYPE:${unBool enableTruetype}]' \
+        --replace '[FPS:NO]' '[FPS:${unBool enableFPS}]'
+    '';
+
     ignoreCollisions = true;
   };
 in
@@ -78,26 +111,5 @@ stdenv.mkDerivation rec {
     chmod 755 $out/bin/soundsense
   '';
 
-  postBuild = ''
-    # De-symlink init.txt
-    cp $out/data/init/init.txt init.txt
-    rm $out/data/init/init.txt
-    mv init.txt $out/data/init/init.txt
-  '' + lib.optionalString enableDFHack ''
-    rm $out/hack/symbols.xml
-    echo "[$out/hack/symbols.xml] $(cat ${dwarf-fortress}/hash.md5.orig) => $(cat ${dwarf-fortress}/hash.md5)"
-    substitute ${dfhack_}/hack/symbols.xml $out/hack/symbols.xml \
-      --replace $(cat ${dwarf-fortress}/hash.md5.orig) \
-                $(cat ${dwarf-fortress}/hash.md5)
-  '' + lib.optionalString enableTWBT ''
-    substituteInPlace $out/data/init/init.txt \
-      --replace '[PRINT_MODE:2D]' '[PRINT_MODE:TWBT]'
-  '' + ''
-    substituteInPlace $out/data/init/init.txt \
-      --replace '[INTRO:YES]' '[INTRO:${unBool enableIntro}]' \
-      --replace '[TRUETYPE:YES]' '[TRUETYPE:${unBool enableTruetype}]' \
-      --replace '[FPS:NO]' '[FPS:${unBool enableFPS}]'
-  '';
-
   preferLocalBuild = true;
 }