diff -r 841b66e4397a src/video/cocoa/SDL_cocoamouse.m
--- a/src/video/cocoa/SDL_cocoamouse.m	Wed Feb 26 11:35:02 2014 -0800
+++ b/src/video/cocoa/SDL_cocoamouse.m	Wed Feb 26 15:11:26 2014 -0800
@@ -246,6 +246,14 @@ Cocoa_SetRelativeMouseMode(SDL_bool enab
 {
     CGError result;
 
+    SDL_Window *window = SDL_GetMouseFocus();
+    if (window && window->driverdata) {
+        SDL_WindowData *data = (SDL_WindowData *) window->driverdata;
+        if ([data->listener isMoving]) {
+            return;
+        }
+    }
+
     if (enabled) {
         DLog("Turning on.");
         result = CGAssociateMouseAndMouseCursorPosition(NO);