diff --git a/.github/workflows/rust-ci-full.yml b/.github/workflows/rust-ci-full.yml
index ede0f4edcd..ef1bbca42a 100644
--- a/.github/workflows/rust-ci-full.yml
+++ b/.github/workflows/rust-ci-full.yml
@@ -161,6 +161,7 @@ jobs:
       USE_SCCACHE: ${{ (matrix.runner == 'macos-15-xlarge' && matrix.target == 'x86_64-apple-darwin') && 'false' || 'true' }}
       CARGO_INCREMENTAL: "0"
       SCCACHE_CACHE_SIZE: 10G
+      SCCACHE_IDLE_TIMEOUT: "0"
       # In rust-ci, representative release-profile checks use thin LTO for faster feedback.
       CARGO_PROFILE_RELEASE_LTO: ${{ matrix.profile == 'release' && 'thin' || 'fat' }}
 
@@ -559,6 +560,7 @@ jobs:
       USE_SCCACHE: ${{ (matrix.runner == 'macos-15-xlarge' && matrix.target == 'x86_64-apple-darwin') && 'false' || 'true' }}
       CARGO_INCREMENTAL: "0"
       SCCACHE_CACHE_SIZE: 10G
+      SCCACHE_IDLE_TIMEOUT: "0"
       WINDOWS_NEXTEST_THREADS: ${{ github.event_name == 'workflow_dispatch' && inputs.windows_nextest_threads || '' }}
 
     strategy: