diff --git a/src/core.c b/src/core.c
index 5e653b0c9..96e8c071c 100644
--- a/src/core.c
+++ b/src/core.c
@@ -1174,7 +1174,7 @@ void SetClipboardText(const char *text)
 }
 
 // Get current operating system used
-void GetOS()
+const char *GetOS(void)
 {
     #ifdef _WIN32 || _WIN64
         return "Windows";
diff --git a/src/raylib.h b/src/raylib.h
index 6367ef691..0bc989cd9 100644
--- a/src/raylib.h
+++ b/src/raylib.h
@@ -898,7 +898,7 @@ RLAPI Vector2 GetWindowPosition(void);                            // Get window
 RLAPI const char *GetMonitorName(int monitor);                    // Get the human-readable, UTF-8 encoded name of the primary monitor
 RLAPI const char *GetClipboardText(void);                         // Get clipboard text content
 RLAPI void SetClipboardText(const char *text);                    // Set clipboard text content
-RLAPI void GetOS();                                               // Get current operating system
+RLAPI const char *GetOS(void);                                    // Get current operating system
 
 // Cursor-related functions
 RLAPI void ShowCursor(void);                                      // Shows cursor