diff --git a/.github/workflows/builds.yml b/.github/workflows/builds.yml
index 9793eeb245..10816074a8 100644
--- a/.github/workflows/builds.yml
+++ b/.github/workflows/builds.yml
@@ -148,6 +148,9 @@ jobs:
         run: tar zxvf ../dist/suricata-*.tar.gz --strip-components=1
       - working-directory: suricata
         run: ./configure
+      - working-directory: suricata
+        name: Check that Rust is using --frozen
+        run: grep -q '^FROZEN' rust/Makefile
       - working-directory: suricata
         run: make -j2
       - working-directory: suricata