diff --git a/.github/workflows/swift.yml b/.github/workflows/swift.yml
index ebf29716..d54ca67d 100644
--- a/.github/workflows/swift.yml
+++ b/.github/workflows/swift.yml
@@ -74,8 +74,6 @@ jobs:
             ccache-${{ runner.os }}-
       - name: Configure ccache
         run: |
-          echo "CC=ccache clang" >> "$GITHUB_ENV"
-          echo "CXX=ccache clang++" >> "$GITHUB_ENV"
           ccache --max-size="$CCACHE_MAXSIZE"
           ccache --zero-stats
       - name: Prepare ladybug sources
@@ -87,6 +85,8 @@ jobs:
             -destination "${{ matrix.destination }}" \
             -configuration ${{ matrix.config }} \
             ENABLE_TESTABILITY=YES \
+            C_COMPILER_LAUNCHER=ccache \
+            CLANG_ENABLE_EXPLICIT_MODULES_WITH_COMPILER_LAUNCHER=YES \
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO
       - name: Test on iOS Simulator
@@ -96,6 +96,8 @@ jobs:
             -destination "${{ matrix.destination }}" \
             -configuration ${{ matrix.config }} \
             ENABLE_TESTABILITY=YES \
+            C_COMPILER_LAUNCHER=ccache \
+            CLANG_ENABLE_EXPLICIT_MODULES_WITH_COMPILER_LAUNCHER=YES \
             CODE_SIGN_IDENTITY="" \
             CODE_SIGNING_REQUIRED=NO
       - name: Show ccache stats
diff --git a/Tests/ladybug-swiftTests/ExtensionTests.swift b/Tests/ladybug-swiftTests/ExtensionTests.swift
index 8c160752..5c5907dc 100644
--- a/Tests/ladybug-swiftTests/ExtensionTests.swift
+++ b/Tests/ladybug-swiftTests/ExtensionTests.swift
@@ -11,6 +11,10 @@ import XCTest
 
 final class ExtensionTests: XCTestCase {
     func testGds() async throws {
+        #if os(iOS)
+            throw XCTSkip("ALGO extension installation is not available on iOS simulator")
+        #endif
+
         func normalize(_ rows: [[String]]) -> [[String]] {
             return
                 rows