diff --git a/exwm-floating.el b/exwm-floating.el
index 9d4d948..20b3fc4 100644
--- a/exwm-floating.el
+++ b/exwm-floating.el
@@ -70,6 +70,7 @@
 (defvar exwm-workspace--list)
 (defvar exwm-workspace-current-index)
 (defvar exwm-workspace--switch-history-outdated)
+(defvar exwm-workspace--struts)
 
 (declare-function exwm-layout--refresh "exwm-layout.el" ())
 (declare-function exwm-layout--show "exwm-layout.el" (id &optional window))
@@ -242,7 +243,18 @@
           (exwm-floating-hide))
       (with-selected-frame exwm-workspace--current
         (exwm-layout--refresh))
-      (select-frame-set-input-focus frame)))
+      (select-frame-set-input-focus frame))
+    ;; FIXME: Strangely, the Emacs frame can move itself at this point
+    ;;        when there are left/top struts set.  Force resetting its
+    ;;        position seems working, but it'd better to figure out why.
+    (when exwm-workspace--struts
+      (xcb:+request exwm--connection
+          (make-instance 'xcb:ConfigureWindow
+                         :window outer-id
+                         :value-mask (logior xcb:ConfigWindow:X
+                                             xcb:ConfigWindow:Y)
+                         :x 0 :y 0))
+      (xcb:flush exwm--connection)))
   (run-hooks 'exwm-floating-setup-hook)
   ;; Redraw the frame.
   (redisplay))
diff --git a/exwm-workspace.el b/exwm-workspace.el
index a7e6681..5c8279e 100644
--- a/exwm-workspace.el
+++ b/exwm-workspace.el
@@ -191,32 +191,36 @@ Value nil means to use the default position which is fixed at bottom, while
           (`left
            (setq delta (- (aref w 0) width))
            (when (and (< delta 0)
-                      (< (max (aref position 0) (aref w 1))
-                         (min (aref position 1)
-                              (+ (aref w 1) (aref w 3)))))
+                      (or (not position)
+                          (< (max (aref position 0) (aref w 1))
+                             (min (aref position 1)
+                                  (+ (aref w 1) (aref w 3))))))
              (cl-incf (aref w 2) delta)
              (setf (aref w 0) width)))
           (`right
            (setq delta (- root-width (aref w 0) (aref w 2) width))
            (when (and (< delta 0)
-                      (< (max (aref position 0) (aref w 1))
-                         (min (aref position 1)
-                              (+ (aref w 1) (aref w 3)))))
+                      (or (not position)
+                          (< (max (aref position 0) (aref w 1))
+                             (min (aref position 1)
+                                  (+ (aref w 1) (aref w 3))))))
              (cl-incf (aref w 2) delta)))
           (`top
            (setq delta (- (aref w 1) width))
            (when (and (< delta 0)
-                      (< (max (aref position 0) (aref w 0))
-                         (min (aref position 1)
-                              (+ (aref w 0) (aref w 2)))))
+                      (or (not position)
+                          (< (max (aref position 0) (aref w 0))
+                             (min (aref position 1)
+                                  (+ (aref w 0) (aref w 2))))))
              (cl-incf (aref w 3) delta)
              (setf (aref w 1) width)))
           (`bottom
            (setq delta (- root-height (aref w 1) (aref w 3) width))
            (when (and (< delta 0)
-                      (< (max (aref position 0) (aref w 0))
-                         (min (aref position 1)
-                              (+ (aref w 0) (aref w 2)))))
+                      (or (not position)
+                          (< (max (aref position 0) (aref w 0))
+                             (min (aref position 1)
+                                  (+ (aref w 0) (aref w 2))))))
              (cl-incf (aref w 3) delta))))))
     ;; Save the result.
     (setq exwm-workspace--workareas workareas)