diff --git a/.github/workflows/build_language.yml b/.github/workflows/build_language.yml
index 1b7d6ee4e..0f97c7339 100644
--- a/.github/workflows/build_language.yml
+++ b/.github/workflows/build_language.yml
@@ -54,12 +54,22 @@ jobs:
           sed -i "s|@Build@|${GAME_BUILD:0:255}|" Ja2/GameVersion.cpp
           cat Ja2/GameVersion.cpp
 
+      - name: Turn on link-time optimization?
+        if: fromJSON(inputs.assemble)
+        shell: bash
+        run: |
+          set -eux
+
+          echo "
+          LTO=ON
+          " >> $GITHUB_ENV
+
       - name: Prepare build properties
         shell: bash
         run: |
           set -eux
           
-          touch CMakeUserPresets.json
+          touch CMakePresets.json
 
           JA2Language=$(echo '${{ inputs.language }}' | tr '[:lower:]' '[:upper:]')
           JA2Application=$(echo '${{ matrix.application }}' | tr '[:lower:]' '[:upper:]')
@@ -77,7 +87,7 @@ jobs:
           arch: x86
       - name: Prepare build
         run: |
-          cmake -S . -B build -GNinja -DCMAKE_BUILD_TYPE=Release -DLanguages="$Env:JA2Language" -DApplications="$Env:JA2Application"
+          cmake -S . -B build -GNinja -DCMAKE_BUILD_TYPE=Release -DLanguages="$Env:JA2Language" -DApplications="$Env:JA2Application" -DLTO_OPTION="$Env:LTO"
       - name: Build
         run: |
           cmake --build build/ -- -v