diff --git a/base_cpp/include/embb/base/internal/mutex-inl.h b/base_cpp/include/embb/base/internal/mutex-inl.h
index 0d9b336..86f66ac 100644
--- a/base_cpp/include/embb/base/internal/mutex-inl.h
+++ b/base_cpp/include/embb/base/internal/mutex-inl.h
@@ -28,6 +28,7 @@
 #define EMBB_BASE_INTERNAL_MUTEX_INL_H_
 
 #include <cassert>
+#include <algorithm>
 
 namespace embb {
 namespace base {
@@ -95,8 +96,8 @@ void UniqueLock<Mutex>::Unlock() {
 
 template<typename Mutex>
 void UniqueLock<Mutex>::Swap(UniqueLock<Mutex>& other) {
-  locked_ = other.locked_;
-  mutex_ = other.Release();
+  std::swap(mutex_, other.mutex_);
+  std::swap(locked_, other.locked_);
 }
 
 template<typename Mutex>
diff --git a/base_cpp/include/embb/base/mutex.h b/base_cpp/include/embb/base/mutex.h
index 0b8c7e3..1d63027 100644
--- a/base_cpp/include/embb/base/mutex.h
+++ b/base_cpp/include/embb/base/mutex.h
@@ -439,11 +439,11 @@ class UniqueLock {
   void Unlock();
 
   /**
-   * Transfers ownership of a mutex to this lock.
+   * Exchanges ownership of the wrapped mutex with another lock.
    */
   void Swap(
     UniqueLock<Mutex>& other
-    /**< [IN/OUT] Lock from which ownership shall be transferred */
+    /**< [IN/OUT] The lock to exchange ownership with */
     );
 
   /**
diff --git a/base_cpp/test/mutex_test.cc b/base_cpp/test/mutex_test.cc
index 17e5c9e..48cc0a9 100644
--- a/base_cpp/test/mutex_test.cc
+++ b/base_cpp/test/mutex_test.cc
@@ -191,13 +191,21 @@ void MutexTest::TestUniqueLock() {
   }
 
   { // Test lock swapping
-    UniqueLock<> lock1;
-    UniqueLock<> lock2(mutex_);
-    PT_EXPECT_EQ(lock1.OwnsLock(), false);
-    PT_EXPECT_EQ(lock2.OwnsLock(), true);
-    lock1.Swap(lock2);
+    UniqueLock<> lock1(mutex_);
     PT_EXPECT_EQ(lock1.OwnsLock(), true);
-    PT_EXPECT_EQ(lock2.OwnsLock(), false);
+
+    {
+      UniqueLock<> lock2;
+      PT_EXPECT_EQ(lock2.OwnsLock(), false);
+
+      lock1.Swap(lock2);
+      PT_EXPECT_EQ(lock1.OwnsLock(), false);
+      PT_EXPECT_EQ(lock2.OwnsLock(), true);
+    }
+
+    // At this point, "lock2" was destroyed and "mutex_" must be unlocked.
+    UniqueLock<> lock3(mutex_, embb::base::try_lock);
+    PT_EXPECT_EQ(lock3.OwnsLock(), true);
   }
 }