diff --git a/apps/openmw/mwbase/inputmanager.hpp b/apps/openmw/mwbase/inputmanager.hpp
index d865bfb0e..fdbab9fac 100644
--- a/apps/openmw/mwbase/inputmanager.hpp
+++ b/apps/openmw/mwbase/inputmanager.hpp
@@ -22,7 +22,7 @@ namespace MWBase
 
             virtual ~InputManager() {}
 
-            virtual void update() = 0;
+            virtual void update(float duration) = 0;
 
             virtual void changeInputMode(bool guiMode) = 0;
 
diff --git a/apps/openmw/mwinput/inputmanagerimp.cpp b/apps/openmw/mwinput/inputmanagerimp.cpp
index df0a42996..0945842b2 100644
--- a/apps/openmw/mwinput/inputmanagerimp.cpp
+++ b/apps/openmw/mwinput/inputmanagerimp.cpp
@@ -450,7 +450,7 @@ private:
         }
     }
 
-    void toggleControlSwitch(std::string sw, bool value)
+    void toggleControlSwitch(const std::string &sw, bool value)
     {
         if (mControlSwitch[sw] == value) {
             return;
@@ -472,7 +472,7 @@ private:
         mControlSwitch[sw] = value;
     }
 
-    bool getControlSwitch(std::string sw)
+    bool getControlSwitch(const std::string &sw)
     {
         return mControlSwitch[sw];
     }
@@ -536,7 +536,7 @@ private:
         impl->toggleControlSwitch(sw, value);
     }
 
-    bool MWInputManager::getControlSwitch(std::string sw)
+    bool MWInputManager::getControlSwitch(const std::string &sw)
     {
         return impl->getControlSwitch(sw);
     }
diff --git a/apps/openmw/mwinput/inputmanagerimp.hpp b/apps/openmw/mwinput/inputmanagerimp.hpp
index eff2236d4..d4ca32d2f 100644
--- a/apps/openmw/mwinput/inputmanagerimp.hpp
+++ b/apps/openmw/mwinput/inputmanagerimp.hpp
@@ -60,8 +60,8 @@ namespace MWInput
 
     virtual void setDragDrop(bool dragDrop);
 
-    void toggleControlSwitch(std::string sw, bool value);
-    bool getControlSwitch(std::string sw);
+    void toggleControlSwitch(const std::string &sw, bool value);
+    bool getControlSwitch(const std::string &sw);
   };
 }
 #endif