diff --git a/src/ex_docmd.c b/src/ex_docmd.c
index 66c0b66..1ccd38e 100644
--- a/src/ex_docmd.c
+++ b/src/ex_docmd.c
@@ -6365,7 +6365,7 @@
     if (cmdmod.split & WSP_VERT)
     {
 	if (*eap->arg == '-' || *eap->arg == '+')
-	    n += curwin->w_width;
+	    n += wp->w_width;
 	else if (n == 0 && eap->arg[0] == NUL)	// default is very wide
 	    n = 9999;
 	win_setwidth_win((int)n, wp);
@@ -6373,7 +6373,7 @@
     else
     {
 	if (*eap->arg == '-' || *eap->arg == '+')
-	    n += curwin->w_height;
+	    n += wp->w_height;
 	else if (n == 0 && eap->arg[0] == NUL)	// default is very high
 	    n = 9999;
 	win_setheight_win((int)n, wp);
diff --git a/src/testdir/test_window_cmd.vim b/src/testdir/test_window_cmd.vim
index a4b4f53..51d0722 100644
--- a/src/testdir/test_window_cmd.vim
+++ b/src/testdir/test_window_cmd.vim
@@ -1144,6 +1144,10 @@
   exe other_winnr .. 'resize 10'
   call assert_equal(10, winheight(other_winnr))
   call assert_equal(&lines - 10 - 3, winheight(0))
+  exe other_winnr .. 'resize +1'
+  exe other_winnr .. 'resize +1'
+  call assert_equal(12, winheight(other_winnr))
+  call assert_equal(&lines - 10 - 3 -2, winheight(0))
 
   %bwipe!
 endfunc
diff --git a/src/version.c b/src/version.c
index cc98769..ff532f1 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1856,
+/**/
     1855,
 /**/
     1854,