diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 8d1883f7..0d7c9177 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -231,7 +231,7 @@ jobs:
         Write-Host "Using vcpkg toolchain: $vcpkgToolchain"
         
         cmake -B build -G "Ninja" `
-          -DCMAKE_BUILD_TYPE=$env:BUILD_TYPE `
+          -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} `
           -DCMAKE_C_COMPILER=${{ matrix.cc }} `
           -DCMAKE_CXX_COMPILER=${{ matrix.cxx }} `
           -DCMAKE_TOOLCHAIN_FILE="$vcpkgToolchain" `
diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index fbcc5ee2..4c42e038 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -238,7 +238,7 @@ jobs:
           Write-Host "Using vcpkg toolchain: $vcpkgToolchain"
 
           cmake -B build -G "Ninja" `
-            -DCMAKE_BUILD_TYPE=$env:BUILD_TYPE `
+            -DCMAKE_BUILD_TYPE=${{ env.BUILD_TYPE }} `
             -DCMAKE_C_COMPILER=${{ matrix.cc }} `
             -DCMAKE_CXX_COMPILER=${{ matrix.cxx }} `
             -DCMAKE_TOOLCHAIN_FILE="$vcpkgToolchain" `