diff --git a/include/MiniFB.h b/include/MiniFB.h
index a32c771..1e6c5a4 100644
--- a/include/MiniFB.h
+++ b/include/MiniFB.h
@@ -59,13 +59,13 @@ const uint8_t *     mfb_get_key_buffer(struct mfb_window *window);          // O
 void                mfb_set_target_fps(uint32_t fps);
 bool                mfb_wait_sync(struct mfb_window *window);
 
-struct mfb_timer *  mfb_timer_create();
+struct mfb_timer *  mfb_timer_create(void);
 void                mfb_timer_destroy(struct mfb_timer *tmr);
 void                mfb_timer_reset(struct mfb_timer *tmr);
 double              mfb_timer_now(struct mfb_timer *tmr);
 double              mfb_timer_delta(struct mfb_timer *tmr);
-double              mfb_timer_get_frequency();
-double              mfb_timer_get_resolution();
+double              mfb_timer_get_frequency(void);
+double              mfb_timer_get_resolution(void);
 
 ///////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
 
diff --git a/src/MiniFB_common.c b/src/MiniFB_common.c
index b6e1aca..f3c009b 100755
--- a/src/MiniFB_common.c
+++ b/src/MiniFB_common.c
@@ -565,6 +565,9 @@ mfb_get_key_name(mfb_key key) {
         case KB_KEY_MENU:
             return "Menu";
 
+        case KB_KEY_UNKNOWN:
+            return "Unknown";
     }
+    
     return "Unknown";
 }
diff --git a/src/MiniFB_internal.h b/src/MiniFB_internal.h
index af30627..7ba4062 100755
--- a/src/MiniFB_internal.h
+++ b/src/MiniFB_internal.h
@@ -18,7 +18,7 @@ extern "C" {
 #endif
 
     extern short int g_keycodes[512];
-    void init_keycodes();
+    void init_keycodes(void);
     void keyboard_default(struct mfb_window *window, mfb_key key, mfb_key_mod mod, bool isPressed);
 
 #if defined(__cplusplus)
diff --git a/src/MiniFB_linux.c b/src/MiniFB_linux.c
index 9fa406c..5d6611d 100644
--- a/src/MiniFB_linux.c
+++ b/src/MiniFB_linux.c
@@ -1,3 +1,5 @@
+#if defined(__linux__)
+
 #include <time.h>
 #include <MiniFB.h>
 
@@ -30,3 +32,6 @@ mfb_timer_init() {
     }
     g_timer_resolution = 1.0 / g_timer_frequency;
 }
+
+#endif
+
diff --git a/src/MiniFB_timer.c b/src/MiniFB_timer.c
index f1a9946..f032b28 100644
--- a/src/MiniFB_timer.c
+++ b/src/MiniFB_timer.c
@@ -8,8 +8,8 @@ double      g_timer_resolution;
 double      g_time_for_frame = 1.0 / 60.0;
 
 //-------------------------------------
-extern uint64_t mfb_timer_tick();
-extern void mfb_timer_init();
+extern uint64_t mfb_timer_tick(void);
+extern void mfb_timer_init(void);
 
 //-------------------------------------
 void