diff --git a/src/frame.c b/src/frame.c
index 8ede3ac97ea..cb597b0c614 100644
--- a/src/frame.c
+++ b/src/frame.c
@@ -1376,7 +1376,7 @@ before calling this function on it, like this.\n\
 #ifdef HAVE_WINDOW_SYSTEM
   if (FRAME_WINDOW_P (XFRAME (frame)))
     /* Warping the mouse will cause  enternotify and focus events. */
-    x_set_mouse_position (XFRAME (frame), x, y);
+    x_set_mouse_position (XFRAME (frame), XINT (x), XINT (y));
 #else
 #if defined (MSDOS) && defined (HAVE_MOUSE)
   if (FRAME_MSDOS_P (XFRAME (frame)))
@@ -1408,7 +1408,7 @@ before calling this function on it, like this.\n\
 #ifdef HAVE_WINDOW_SYSTEM
   if (FRAME_WINDOW_P (XFRAME (frame)))
     /* Warping the mouse will cause  enternotify and focus events. */
-    x_set_mouse_pixel_position (XFRAME (frame), x, y);
+    x_set_mouse_pixel_position (XFRAME (frame), XINT (x), XINT (y));
 #else
 #if defined (MSDOS) && defined (HAVE_MOUSE)
   if (FRAME_MSDOS_P (XFRAME (frame)))