diff --git a/.github/workflows/msys.yml b/.github/workflows/msys.yml
index e90f7dc0a..87f08a089 100644
--- a/.github/workflows/msys.yml
+++ b/.github/workflows/msys.yml
@@ -35,7 +35,7 @@ jobs:
 
       - name: Build Aegisub
         run: |
-          meson builddir -Ddefault_library=static
+          meson builddir -Dbuildtype=release -Ddefault_library=static
           ninja -C builddir
 
       - name: Create installer