diff --git a/.github/workflows/build-toolchain.yml b/.github/workflows/build-toolchain.yml
index cffd690a40bad..af358e12e747f 100644
--- a/.github/workflows/build-toolchain.yml
+++ b/.github/workflows/build-toolchain.yml
@@ -137,6 +137,8 @@ jobs:
           TARGET_STDLIB_BUILD_DIR=${{ github.workspace }}/target-build/swift-stdlib-wasi-wasm32
           ./swift/utils/run-test --build-dir "$TARGET_STDLIB_BUILD_DIR" --target wasi-wasm32 \
             "$TARGET_STDLIB_BUILD_DIR/test-wasi-wasm32/stdlib"
+          ./swift/utils/run-test --build-dir "$TARGET_STDLIB_BUILD_DIR" --target wasi-wasm32 \
+            "$TARGET_STDLIB_BUILD_DIR/test-wasi-wasm32/Concurrency/Runtime"
 
       - name: Run all tests for wasi-wasm32
         if: ${{ matrix.run_full_test }}
diff --git a/cmake/caches/Runtime-WASI-wasm32.cmake b/cmake/caches/Runtime-WASI-wasm32.cmake
index 3e75ec54a4cc7..b4f894f94efa9 100644
--- a/cmake/caches/Runtime-WASI-wasm32.cmake
+++ b/cmake/caches/Runtime-WASI-wasm32.cmake
@@ -27,4 +27,4 @@ set(SWIFT_STDLIB_ENABLE_THINCMO YES CACHE BOOL "")
 # build with the host compiler
 set(SWIFT_BUILD_RUNTIME_WITH_HOST_COMPILER YES CACHE BOOL "")
 
-set(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME YES CACHE BOOL "")
+set(SWIFT_STDLIB_SINGLE_THREADED_RUNTIME TRUE CACHE BOOL "")
diff --git a/utils/webassembly/build-presets.ini b/utils/webassembly/build-presets.ini
index f27963848855b..26051eced3546 100644
--- a/utils/webassembly/build-presets.ini
+++ b/utils/webassembly/build-presets.ini
@@ -3,7 +3,6 @@
 #===----------------------------------------------------------------------===#
 
 [preset: webassembly]
-sccache
 skip-build-benchmarks
 llvm-targets-to-build=X86;AArch64;WebAssembly
 swift-darwin-supported-archs=%(HOST_ARCHITECTURE)s