diff --git a/src/bootstrap/src/core/build_steps/format.rs b/src/bootstrap/src/core/build_steps/format.rs
index 253a33183bfd..5556e5e631bc 100644
--- a/src/bootstrap/src/core/build_steps/format.rs
+++ b/src/bootstrap/src/core/build_steps/format.rs
@@ -74,7 +74,7 @@ fn verify_rustfmt_version(build: &Builder<'_>) -> bool {
     let Some((version, stamp_file)) = get_rustfmt_version(build) else {
         return false;
     };
-    stamp_file.with_stamp(version).is_up_to_date()
+    stamp_file.add_stamp(version).is_up_to_date()
 }
 
 /// Updates the last rustfmt version used.
diff --git a/src/bootstrap/src/core/build_steps/gcc.rs b/src/bootstrap/src/core/build_steps/gcc.rs
index f55a17aab046..d090644c5b7f 100644
--- a/src/bootstrap/src/core/build_steps/gcc.rs
+++ b/src/bootstrap/src/core/build_steps/gcc.rs
@@ -55,7 +55,7 @@ pub fn prebuilt_gcc_config(builder: &Builder<'_>, target: TargetSelection) -> Gc
         )
     });
 
-    let stamp = BuildStamp::new(&out_dir).with_prefix("gcc").with_stamp(smart_stamp_hash);
+    let stamp = BuildStamp::new(&out_dir).with_prefix("gcc").add_stamp(smart_stamp_hash);
 
     if stamp.is_up_to_date() {
         if stamp.stamp.is_empty() {
diff --git a/src/bootstrap/src/core/build_steps/llvm.rs b/src/bootstrap/src/core/build_steps/llvm.rs
index 51df2eba6e9c..a70dc85aab4a 100644
--- a/src/bootstrap/src/core/build_steps/llvm.rs
+++ b/src/bootstrap/src/core/build_steps/llvm.rs
@@ -135,7 +135,7 @@ pub fn prebuilt_llvm_config(
         )
     });
 
-    let stamp = BuildStamp::new(&out_dir).with_prefix("llvm").with_stamp(smart_stamp_hash);
+    let stamp = BuildStamp::new(&out_dir).with_prefix("llvm").add_stamp(smart_stamp_hash);
 
     if stamp.is_up_to_date() {
         if stamp.stamp.is_empty() {
@@ -921,7 +921,7 @@ impl Step for Enzyme {
         });
 
         let out_dir = builder.enzyme_out(target);
-        let stamp = BuildStamp::new(&out_dir).with_prefix("enzyme").with_stamp(smart_stamp_hash);
+        let stamp = BuildStamp::new(&out_dir).with_prefix("enzyme").add_stamp(smart_stamp_hash);
 
         if stamp.is_up_to_date() {
             if stamp.stamp.is_empty() {
@@ -1137,8 +1137,7 @@ impl Step for Sanitizers {
             )
         });
 
-        let stamp =
-            BuildStamp::new(&out_dir).with_prefix("sanitizers").with_stamp(smart_stamp_hash);
+        let stamp = BuildStamp::new(&out_dir).with_prefix("sanitizers").add_stamp(smart_stamp_hash);
 
         if stamp.is_up_to_date() {
             if stamp.stamp.is_empty() {
diff --git a/src/bootstrap/src/core/download.rs b/src/bootstrap/src/core/download.rs
index 78bb5747ffd9..c477bdb829a9 100644
--- a/src/bootstrap/src/core/download.rs
+++ b/src/bootstrap/src/core/download.rs
@@ -428,7 +428,7 @@ impl Config {
         let host = self.build;
 
         let clippy_stamp =
-            BuildStamp::new(&self.initial_sysroot).with_prefix("clippy").with_stamp(date);
+            BuildStamp::new(&self.initial_sysroot).with_prefix("clippy").add_stamp(date);
         let cargo_clippy = self.initial_sysroot.join("bin").join(exe("cargo-clippy", host));
         if cargo_clippy.exists() && clippy_stamp.is_up_to_date() {
             return cargo_clippy;
@@ -462,7 +462,7 @@ impl Config {
         let host = self.build;
         let bin_root = self.out.join(host).join("rustfmt");
         let rustfmt_path = bin_root.join("bin").join(exe("rustfmt", host));
-        let rustfmt_stamp = BuildStamp::new(&bin_root).with_prefix("rustfmt").with_stamp(channel);
+        let rustfmt_stamp = BuildStamp::new(&bin_root).with_prefix("rustfmt").add_stamp(channel);
         if rustfmt_path.exists() && rustfmt_stamp.is_up_to_date() {
             return Some(rustfmt_path);
         }
@@ -569,7 +569,7 @@ impl Config {
     ) {
         let host = self.build.triple;
         let bin_root = self.out.join(host).join(sysroot);
-        let rustc_stamp = BuildStamp::new(&bin_root).with_prefix("rustc").with_stamp(stamp_key);
+        let rustc_stamp = BuildStamp::new(&bin_root).with_prefix("rustc").add_stamp(stamp_key);
 
         if !bin_root.join("bin").join(exe("rustc", self.build)).exists()
             || !rustc_stamp.is_up_to_date()
@@ -732,7 +732,7 @@ download-rustc = false
         let llvm_root = self.ci_llvm_root();
         let llvm_sha = detect_llvm_sha(self, self.rust_info.is_managed_git_subrepository());
         let stamp_key = format!("{}{}", llvm_sha, self.llvm_assertions);
-        let llvm_stamp = BuildStamp::new(&llvm_root).with_prefix("llvm").with_stamp(stamp_key);
+        let llvm_stamp = BuildStamp::new(&llvm_root).with_prefix("llvm").add_stamp(stamp_key);
         if !llvm_stamp.is_up_to_date() && !self.dry_run() {
             self.download_ci_llvm(&llvm_sha);
 
diff --git a/src/bootstrap/src/utils/build_stamp.rs b/src/bootstrap/src/utils/build_stamp.rs
index ae35b4c8d61c..831385c762ad 100644
--- a/src/bootstrap/src/utils/build_stamp.rs
+++ b/src/bootstrap/src/utils/build_stamp.rs
@@ -41,8 +41,8 @@ impl BuildStamp {
     }
 
     /// Sets stamp content to the specified value.
-    pub fn with_stamp<S: ToString>(mut self, stamp: S) -> Self {
-        self.stamp = stamp.to_string();
+    pub fn add_stamp<S: ToString>(mut self, stamp: S) -> Self {
+        self.stamp.push_str(&stamp.to_string());
         self
     }
 
diff --git a/src/bootstrap/src/utils/build_stamp/tests.rs b/src/bootstrap/src/utils/build_stamp/tests.rs
index 0637897507a1..2d7d1f712465 100644
--- a/src/bootstrap/src/utils/build_stamp/tests.rs
+++ b/src/bootstrap/src/utils/build_stamp/tests.rs
@@ -26,7 +26,7 @@ fn test_with_invalid_prefix2() {
 fn test_is_up_to_date() {
     let dir = temp_dir();
 
-    let mut build_stamp = BuildStamp::new(&dir).with_stamp("v1.0.0");
+    let mut build_stamp = BuildStamp::new(&dir).add_stamp("v1.0.0");
     build_stamp.write().unwrap();
 
     assert!(
@@ -47,7 +47,7 @@ fn test_is_up_to_date() {
 fn test_with_prefix() {
     let dir = temp_dir();
 
-    let stamp = BuildStamp::new(&dir).with_stamp("v1.0.0");
+    let stamp = BuildStamp::new(&dir).add_stamp("v1.0.0");
     assert_eq!(stamp.path.file_name().unwrap(), ".stamp");
 
     let stamp = stamp.with_prefix("test");