diff --git a/src/fps_limiter.cc b/src/fps_limiter.cc
index 8ac9a56..7b62137 100644
--- a/src/fps_limiter.cc
+++ b/src/fps_limiter.cc
@@ -4,7 +4,7 @@
 
 namespace fallout {
 
-FpsLimiter::FpsLimiter(std::size_t fps)
+FpsLimiter::FpsLimiter(unsigned int fps)
     : _fps(fps)
     , _ticks(0)
 {
diff --git a/src/fps_limiter.h b/src/fps_limiter.h
index 95df0aa..ce33346 100644
--- a/src/fps_limiter.h
+++ b/src/fps_limiter.h
@@ -1,19 +1,17 @@
 #ifndef FPS_LIMITER_H
 #define FPS_LIMITER_H
 
-#include <cstddef>
-
 namespace fallout {
 
 class FpsLimiter {
 public:
-    FpsLimiter(std::size_t fps = 60);
+    FpsLimiter(unsigned int fps = 60);
     void mark();
     void throttle() const;
 
 private:
-    const std::size_t _fps;
-    std::size_t _ticks;
+    const unsigned int _fps;
+    unsigned int _ticks;
 };
 
 } // namespace fallout