diff --git a/.github/workflows/wheels.yaml b/.github/workflows/wheels.yaml
index b54f7c47..d305a756 100644
--- a/.github/workflows/wheels.yaml
+++ b/.github/workflows/wheels.yaml
@@ -359,7 +359,7 @@ jobs:
           CXX: ${RUNNER_TOOL_CACHE}/llvm/bin/clang++
           CIBW_ENVIRONMENT: CC=${RUNNER_TOOL_CACHE}/llvm/bin/clang CXX=${RUNNER_TOOL_CACHE}/llvm/bin/clang++ CMAKE_BUILD_PARALLEL_LEVEL=1
           CIBW_BEFORE_ALL: |
-            export CMAKE_BUILD_PARALLEL_LEVEL=1
+            set CMAKE_BUILD_PARALLEL_LEVEL=1
           CMAKE_C_COMPILER: ${RUNNER_TOOL_CACHE}/llvm/bin/clang
           CMAKE_CXX_COMPILER: ${RUNNER_TOOL_CACHE}/llvm/bin/clang++