diff --git a/.cirrus.yml b/.cirrus.yml
index 732edd66196d..d627c2ee09c4 100644
--- a/.cirrus.yml
+++ b/.cirrus.yml
@@ -12,8 +12,6 @@ task:
     folder: target
   prepare_script:
     - . $HOME/.cargo/env
-    - git config --global user.email "user@example.com"
-    - git config --global user.name "User"
     - ./y.rs prepare
   test_script:
     - . $HOME/.cargo/env
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index babadc4d4677..a6bb12a66a24 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -90,10 +90,7 @@ jobs:
         sudo apt-get install -y gcc-s390x-linux-gnu qemu-user
 
     - name: Prepare dependencies
-      run: |
-        git config --global user.email "user@example.com"
-        git config --global user.name "User"
-        ./y.rs prepare
+      run: ./y.rs prepare
 
     - name: Build without unstable features
       env:
@@ -183,8 +180,6 @@ jobs:
 
     - name: Prepare dependencies
       run: |
-        git config --global user.email "user@example.com"
-        git config --global user.name "User"
         git config --global core.autocrlf false
         rustc y.rs -o y.exe -g
         ./y.exe prepare
diff --git a/build_system/prepare.rs b/build_system/prepare.rs
index 28322c1cb512..8826f1bd2595 100644
--- a/build_system/prepare.rs
+++ b/build_system/prepare.rs
@@ -180,7 +180,16 @@ fn init_git_repo(repo_dir: &Path) {
     spawn_and_wait(git_add_cmd);
 
     let mut git_commit_cmd = Command::new("git");
-    git_commit_cmd.arg("commit").arg("-m").arg("Initial commit").arg("-q").current_dir(repo_dir);
+    git_commit_cmd
+        .arg("-c")
+        .arg("user.name=Dummy")
+        .arg("-c")
+        .arg("user.email=dummy@example.com")
+        .arg("commit")
+        .arg("-m")
+        .arg("Initial commit")
+        .arg("-q")
+        .current_dir(repo_dir);
     spawn_and_wait(git_commit_cmd);
 }
 
@@ -216,7 +225,15 @@ fn apply_patches(dirs: &Dirs, crate_name: &str, target_dir: &Path) {
             patch.file_name().unwrap()
         );
         let mut apply_patch_cmd = Command::new("git");
-        apply_patch_cmd.arg("am").arg(patch).arg("-q").current_dir(target_dir);
+        apply_patch_cmd
+            .arg("-c")
+            .arg("user.name=Dummy")
+            .arg("-c")
+            .arg("user.email=dummy@example.com")
+            .arg("am")
+            .arg(patch)
+            .arg("-q")
+            .current_dir(target_dir);
         spawn_and_wait(apply_patch_cmd);
     }
 }