diff --git a/.github/workflows/coverage.yml b/.github/workflows/coverage.yml
index 5c3332735a0..be115093f66 100644
--- a/.github/workflows/coverage.yml
+++ b/.github/workflows/coverage.yml
@@ -98,7 +98,7 @@ jobs:
         env:
           CARGO_PROFILE_COV_INHERITS: 'dev'
           CARGO_PROFILE_COV_DEBUG: 1
-          CARGO_PROFILE_COV_OPT_LEVEL: 2
+          CARGO_PROFILE_COV_OPT_LEVEL: 1
           HOMESERVER_URL: "http://localhost:8008"
           HOMESERVER_DOMAIN: "synapse"
           SLIDING_SYNC_PROXY_URL: "http://localhost:8118"