diff --git a/.gitea/workflows/test.yml b/.gitea/workflows/test.yml
index 25f1e13..73f51ed 100644
--- a/.gitea/workflows/test.yml
+++ b/.gitea/workflows/test.yml
@@ -35,8 +35,15 @@ jobs:
     # runner's memory — ld was OOM-killed (signal 9) on runs 447 and 486.
     # line-tables-only keeps file:line in panic backtraces while cutting the
     # link's memory footprint enough to fit the runner.
+    #
+    # CARGO_BUILD_JOBS=2: with one job per core, cargo links several large
+    # test binaries concurrently; as the workspace grew (runs 514/516/519)
+    # two+ simultaneous ld processes OOM-killed the runner again even at
+    # line-tables-only. Two jobs keeps at most two links in flight — the
+    # compile-throughput cost is small next to the cache-warm build.
     env:
       CARGO_PROFILE_DEV_DEBUG: line-tables-only
+      CARGO_BUILD_JOBS: '2'
 
     steps:
       - name: Checkout