diff --git a/.github/workflows/msys.yml b/.github/workflows/msys.yml
index 6e27e8677..c18cfafca 100644
--- a/.github/workflows/msys.yml
+++ b/.github/workflows/msys.yml
@@ -34,7 +34,7 @@ jobs:
 
       - name: Build Aegisub
         run: |
-          MSYSTEM= meson builddir -Ddefault_library=static
+          MSYSTEM= meson builddir -Dbuildtype=release -Ddefault_library=static
           ninja -C builddir
 
       - name: Create installer