diff --git a/src/video/win32/SDL_win32events.c b/src/video/win32/SDL_win32events.c
index 5dcbfa765..682832e05 100644
--- a/src/video/win32/SDL_win32events.c
+++ b/src/video/win32/SDL_win32events.c
@@ -236,7 +236,7 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
         {
             LPBYTE lpb;
             const RAWINPUTHEADER *header;
-            int index;
+            int index = -1;
             int i;
             int size = 0;
             const RAWMOUSE *raw_mouse = NULL;
@@ -261,6 +261,10 @@ WIN_WindowProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
                     break;
                 }
             }
+            if (index < 0) {
+                /* New mouse?  Should we dynamically update mouse list? */
+                return (0);
+            }
 
             GetCursorPos(&point);
             ScreenToClient(hwnd, &point);