diff --git a/.github/workflows.src/ls-build.inc.yml b/.github/workflows.src/ls-build.inc.yml
index 4027df937031..c28e14c98e95 100644
--- a/.github/workflows.src/ls-build.inc.yml
+++ b/.github/workflows.src/ls-build.inc.yml
@@ -132,6 +132,12 @@
         ref: master
         path: edgedb-pkg
 
+    - uses: actions/checkout@v4
+      with:
+        sparse-checkout: rust-toolchain.toml
+        sparse-checkout-cone-mode: false
+        fetch-depth: 0
+
     - name: Install Rust toolchain
       uses: dsherret/rust-toolchain-file@v1
       if: << 'false' if tgt.runs_on and 'self-hosted' in tgt.runs_on else 'true' >>
diff --git a/.github/workflows/ls-nightly.yml b/.github/workflows/ls-nightly.yml
index 7b1090f49abf..66a39ee52812 100644
--- a/.github/workflows/ls-nightly.yml
+++ b/.github/workflows/ls-nightly.yml
@@ -230,6 +230,12 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - uses: actions/checkout@v4
+      with:
+        sparse-checkout: rust-toolchain.toml
+        sparse-checkout-cone-mode: false
+        fetch-depth: 0
+
     - name: Install Rust toolchain
       uses: dsherret/rust-toolchain-file@v1
       if: true
@@ -285,6 +291,12 @@ jobs:
         ref: master
         path: edgedb-pkg
 
+    - uses: actions/checkout@v4
+      with:
+        sparse-checkout: rust-toolchain.toml
+        sparse-checkout-cone-mode: false
+        fetch-depth: 0
+
     - name: Install Rust toolchain
       uses: dsherret/rust-toolchain-file@v1
       if: true