diff --git a/.github/workflows/aarch64.yml b/.github/workflows/aarch64.yml
index 1e8afae7672e..729a016130d5 100644
--- a/.github/workflows/aarch64.yml
+++ b/.github/workflows/aarch64.yml
@@ -36,7 +36,7 @@ jobs:
       - name: Run stdlib specs
         uses: docker://jhass/crystal:1.0.0-alpine-build
         with:
-          args: make std_spec
+          args: make std_spec FLAGS=-Duse_pcre
   aarch64-musl-test-compiler:
     needs: aarch64-musl-build
     runs-on: [linux, ARM64]