diff --git a/cmd-resize-pane.c b/cmd-resize-pane.c
index bbb78de7..cfde83b3 100644
--- a/cmd-resize-pane.c
+++ b/cmd-resize-pane.c
@@ -129,14 +129,16 @@ static void
 cmd_resize_pane_mouse_update(struct client *c, struct mouse_event *m)
 {
 	struct winlink		*wl;
-	struct window_pane	*loop, *wp_x, *wp_y;
-	u_int			 y, ly, x, lx, sx, sy, ex, ey;
+	struct window		*w;
+	u_int			 y, ly, x, lx;
+	struct layout_cell	*lc;
 
 	wl = cmd_mouse_window(m, NULL);
 	if (wl == NULL) {
 		c->tty.mouse_drag_update = NULL;
 		return;
 	}
+	w = wl->window;
 
 	y = m->y; x = m->x;
 	if (m->statusat == 0 && y > 0)
@@ -149,37 +151,16 @@ cmd_resize_pane_mouse_update(struct client *c, struct mouse_event *m)
 	else if (m->statusat > 0 && ly >= (u_int)m->statusat)
 		ly = m->statusat - 1;
 
-	wp_x = wp_y = NULL;
-	TAILQ_FOREACH(loop, &wl->window->panes, entry) {
-		if (!window_pane_visible(loop))
-			continue;
-
-		sx = loop->xoff;
-		if (sx != 0)
-			sx--;
-		ex = loop->xoff + loop->sx;
-
-		sy = loop->yoff;
-		if (sy != 0)
-			sy--;
-		ey = loop->yoff + loop->sy;
-
-		if ((lx == sx || lx == ex) &&
-		    (ly >= sy && ly <= ey) &&
-		    (wp_x == NULL || loop->sy > wp_x->sy))
-			wp_x = loop;
-		if ((ly == sy || ly == ey) &&
-		    (lx >= sx && lx <= ex) &&
-		    (wp_y == NULL || loop->sx > wp_y->sx))
-			wp_y = loop;
-	}
-	if (wp_x == NULL && wp_y == NULL) {
-		c->tty.mouse_drag_update = NULL;
+	lc = layout_search_by_border(w->layout_root, lx, ly);
+	if (lc == NULL)
 		return;
-	}
-	if (wp_x != NULL)
-		layout_resize_pane(wp_x, LAYOUT_LEFTRIGHT, x - lx, 0);
-	if (wp_y != NULL)
-		layout_resize_pane(wp_y, LAYOUT_TOPBOTTOM, y - ly, 0);
-	server_redraw_window(wl->window);
+
+	if (y != ly && lc->parent->type == LAYOUT_TOPBOTTOM)
+		layout_resize_layout(w, lc, LAYOUT_TOPBOTTOM, y - ly, 0);
+	else if (x != lx && lc->parent->type == LAYOUT_LEFTRIGHT)
+		layout_resize_layout(w, lc, LAYOUT_LEFTRIGHT, x - lx, 0);
+	else
+		return;
+
+	server_redraw_window(w);
 }
diff --git a/layout.c b/layout.c
index bab95868..e1112ffa 100644
--- a/layout.c
+++ b/layout.c
@@ -127,6 +127,42 @@ layout_print_cell(struct layout_cell *lc, const char *hdr, u_int n)
 	}
 }
 
+struct layout_cell *
+layout_search_by_border(struct layout_cell *lc, u_int x, u_int y)
+{
+	struct layout_cell	*lcchild, *last = NULL;
+
+	TAILQ_FOREACH(lcchild, &lc->cells, entry) {
+		if (x >= lcchild->xoff && x < lcchild->xoff + lcchild->sx &&
+		    y >= lcchild->yoff && y < lcchild->yoff + lcchild->sy) {
+			/* Inside the cell - recurse. */
+			return (layout_search_by_border(lcchild, x, y));
+		}
+
+		if (last == NULL) {
+			last = lcchild;
+			continue;
+		}
+
+		switch (lc->type) {
+		case LAYOUT_LEFTRIGHT:
+			if (x < lcchild->xoff && x >= last->xoff + last->sx)
+				return (last);
+			break;
+		case LAYOUT_TOPBOTTOM:
+			if (y < lcchild->yoff && y >= last->yoff + last->sy)
+				return (last);
+			break;
+		case LAYOUT_WINDOWPANE:
+			break;
+		}
+
+		last = lcchild;
+	}
+
+	return (NULL);
+}
+
 void
 layout_set_size(struct layout_cell *lc, u_int sx, u_int sy, u_int xoff,
     u_int yoff)
@@ -550,29 +586,11 @@ layout_resize_pane_to(struct window_pane *wp, enum layout_type type,
 	layout_resize_pane(wp, type, change, 1);
 }
 
-/* Resize a single pane within the layout. */
 void
-layout_resize_pane(struct window_pane *wp, enum layout_type type, int change,
-    int opposite)
+layout_resize_layout(struct window *w, struct layout_cell *lc,
+    enum layout_type type, int change, int opposite)
 {
-	struct window		*w = wp->window;
-	struct layout_cell	*lc, *lcparent;
-	int			 needed, size;
-
-	lc = wp->layout_cell;
-
-	/* Find next parent of the same type. */
-	lcparent = lc->parent;
-	while (lcparent != NULL && lcparent->type != type) {
-		lc = lcparent;
-		lcparent = lc->parent;
-	}
-	if (lcparent == NULL)
-		return;
-
-	/* If this is the last cell, move back one. */
-	if (lc == TAILQ_LAST(&lcparent->cells, layout_cells))
-		lc = TAILQ_PREV(lc, layout_cells, entry);
+	int	needed, size;
 
 	/* Grow or shrink the cell. */
 	needed = change;
@@ -591,9 +609,34 @@ layout_resize_pane(struct window_pane *wp, enum layout_type type, int change,
 	}
 
 	/* Fix cell offsets. */
-	layout_fix_offsets(wp->window->layout_root);
-	layout_fix_panes(wp->window, wp->window->sx, wp->window->sy);
-	notify_window("window-layout-changed", wp->window);
+	layout_fix_offsets(w->layout_root);
+	layout_fix_panes(w, w->sx, w->sy);
+	notify_window("window-layout-changed", w);
+}
+
+/* Resize a single pane within the layout. */
+void
+layout_resize_pane(struct window_pane *wp, enum layout_type type, int change,
+    int opposite)
+{
+	struct layout_cell	*lc, *lcparent;
+
+	lc = wp->layout_cell;
+
+	/* Find next parent of the same type. */
+	lcparent = lc->parent;
+	while (lcparent != NULL && lcparent->type != type) {
+		lc = lcparent;
+		lcparent = lc->parent;
+	}
+	if (lcparent == NULL)
+		return;
+
+	/* If this is the last cell, move back one. */
+	if (lc == TAILQ_LAST(&lcparent->cells, layout_cells))
+		lc = TAILQ_PREV(lc, layout_cells, entry);
+
+	layout_resize_layout(wp->window, lc, type, change, opposite);
 }
 
 /* Helper function to grow pane. */
diff --git a/tmux.h b/tmux.h
index d46dca2e..d6e4ae0b 100644
--- a/tmux.h
+++ b/tmux.h
@@ -2203,6 +2203,9 @@ void		 layout_free_cell(struct layout_cell *);
 void		 layout_print_cell(struct layout_cell *, const char *, u_int);
 void		 layout_destroy_cell(struct window *, struct layout_cell *,
 		     struct layout_cell **);
+void		 layout_resize_layout(struct window *, struct layout_cell *,
+		     enum layout_type, int, int);
+struct layout_cell *layout_search_by_border(struct layout_cell *, u_int, u_int);
 void		 layout_set_size(struct layout_cell *, u_int, u_int, u_int,
 		     u_int);
 void		 layout_make_leaf(struct layout_cell *, struct window_pane *);