diff --git a/.github/workflows/ccpp.yml b/.github/workflows/ccpp.yml
index 571d03183f4b..5485763c0560 100644
--- a/.github/workflows/ccpp.yml
+++ b/.github/workflows/ccpp.yml
@@ -44,6 +44,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -125,6 +128,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -207,6 +213,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -290,6 +299,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -349,6 +361,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;
@@ -418,6 +433,9 @@ jobs:
           # install Rust directly using rustup
           curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain=1.72.0;
 
+    - name: Make Source Read-Only
+      run: chmod -R a-w ./*
+
     - name: Configure
       run: |
            mkdir -p gccrs-build;