[Stopwatch] start()/stop() return const &

2 files changed, 4 insertions, 4 deletions

diff --git a/toolsrc/include/Stopwatch.h b/toolsrc/include/Stopwatch.h
index 2bd5c31bf..105a4b1ee 100644
--- a/toolsrc/include/Stopwatch.h
+++ b/toolsrc/include/Stopwatch.h
@@ -14,9 +14,9 @@ namespace vcpkg
 
         bool isRunning() const;
 
-        Stopwatch& start();
+        const Stopwatch& start();
 
-        Stopwatch& stop();
+        const Stopwatch& stop();
 
         Stopwatch& reset();
 
diff --git a/toolsrc/src/Stopwatch.cpp b/toolsrc/src/Stopwatch.cpp
index 035d54c2b..ddc0f8bcb 100644
--- a/toolsrc/src/Stopwatch.cpp
+++ b/toolsrc/src/Stopwatch.cpp
@@ -18,7 +18,7 @@ namespace vcpkg
         return this->m_isRunning;
     }
 
-    Stopwatch& Stopwatch::start()
+    const Stopwatch& Stopwatch::start()
     {
         Checks::check_exit(!this->m_isRunning, "This stopwatch is already running.");
         this->m_isRunning = true;
@@ -26,7 +26,7 @@ namespace vcpkg
         return *this;
     }
 
-    Stopwatch& Stopwatch::stop()
+    const Stopwatch& Stopwatch::stop()
     {
         auto tick = std::chrono::high_resolution_clock::now();
         Checks::check_exit(this->m_isRunning, "This stopwatch is already stopped.");