diff --git a/src/lib/deskflow/KeyMap.cpp b/src/lib/deskflow/KeyMap.cpp
index d69ee108c..d3874507f 100644
--- a/src/lib/deskflow/KeyMap.cpp
+++ b/src/lib/deskflow/KeyMap.cpp
@@ -35,7 +35,7 @@ KeyMap::KeyMap() : m_numGroups(0), m_composeAcrossGroups(false)
   m_modifierKeyItem.m_client = 0;
 }
 
-void KeyMap::swap(KeyMap &x)
+void KeyMap::swap(KeyMap &x) noexcept
 {
   m_keyIDMap.swap(x.m_keyIDMap);
   m_modifierKeys.swap(x.m_modifierKeys);
diff --git a/src/lib/deskflow/KeyMap.h b/src/lib/deskflow/KeyMap.h
index 6dcd1eee1..419cefb90 100644
--- a/src/lib/deskflow/KeyMap.h
+++ b/src/lib/deskflow/KeyMap.h
@@ -123,7 +123,7 @@ public:
   //@{
 
   //! Swap with another \c KeyMap
-  virtual void swap(KeyMap &);
+  virtual void swap(KeyMap &) noexcept;
 
   //! Add a key entry
   /*!
diff --git a/src/unittests/legacytests/mock/deskflow/MockKeyMap.h b/src/unittests/legacytests/mock/deskflow/MockKeyMap.h
index 5c2585aea..41d191181 100644
--- a/src/unittests/legacytests/mock/deskflow/MockKeyMap.h
+++ b/src/unittests/legacytests/mock/deskflow/MockKeyMap.h
@@ -13,7 +13,7 @@
 class MockKeyMap : public deskflow::KeyMap
 {
 public:
-  MOCK_METHOD(void, swap, (KeyMap &), (override));
+  MOCK_METHOD(void, swap, (KeyMap &), (noexcept));
   MOCK_METHOD(void, finish, (), (override));
   MOCK_METHOD(void, foreachKey, (ForeachKeyCallback, void *), (override));
   MOCK_METHOD(void, addHalfDuplexModifier, (KeyID), (override));