diff --git a/es-core/src/InputManager.h b/es-core/src/InputManager.h
index f2810f4c5..b675db2e0 100644
--- a/es-core/src/InputManager.h
+++ b/es-core/src/InputManager.h
@@ -52,7 +52,7 @@ public:
 
     bool parseEvent(const SDL_Event& event, Window* window);
 
-    int getNumJoysticks() { return mJoysticks.size(); }
+    int getNumJoysticks() { return static_cast<int>(mJoysticks.size()); }
 
 private:
     bool initialized() const;