diff --git a/include/input/Input.h b/include/input/Input.h
index cfcafab..756b337 100644
--- a/include/input/Input.h
+++ b/include/input/Input.h
@@ -661,7 +661,7 @@
  */
 class PooledInputEventFactory : public InputEventFactoryInterface {
 public:
-    PooledInputEventFactory(size_t maxPoolSize = 20);
+    explicit PooledInputEventFactory(size_t maxPoolSize = 20);
     virtual ~PooledInputEventFactory();
 
     virtual KeyEvent* createKeyEvent();
diff --git a/include/input/KeyCharacterMap.h b/include/input/KeyCharacterMap.h
index 33d2757..5e542b8 100644
--- a/include/input/KeyCharacterMap.h
+++ b/include/input/KeyCharacterMap.h
@@ -196,7 +196,7 @@
         };
 
         struct Property {
-            inline Property(int32_t property = 0, int32_t metaState = 0) :
+            inline explicit Property(int32_t property = 0, int32_t metaState = 0) :
                     property(property), metaState(metaState) { }
 
             int32_t property;