diff --git a/src/screen.c b/src/screen.c
index 4c134f0..7a9311a 100644
--- a/src/screen.c
+++ b/src/screen.c
@@ -4514,6 +4514,11 @@
 			int	i;
 			int	saved_nextra = n_extra;
 
+#ifdef FEAT_CONCEAL
+			if (is_concealing && vcol_off > 0)
+			    /* there are characters to conceal */
+			    tab_len += vcol_off;
+#endif
 			/* if n_extra > 0, it gives the number of chars, to
 			 * use for a tab, else we need to calculate the width
 			 * for a tab */
@@ -4539,6 +4544,12 @@
 #endif
 			}
 			p_extra = p_extra_free;
+#ifdef FEAT_CONCEAL
+			/* n_extra will be increased by FIX_FOX_BOGUSCOLS
+			 * macro below, so need to adjust for that here */
+			if (is_concealing && vcol_off > 0)
+			    n_extra -= vcol_off;
+#endif
 		    }
 #endif
 #ifdef FEAT_CONCEAL
diff --git a/src/testdir/test_listlbr.in b/src/testdir/test_listlbr.in
index 0cce4c2..2f28126 100644
--- a/src/testdir/test_listlbr.in
+++ b/src/testdir/test_listlbr.in
@@ -46,6 +46,16 @@
 :redraw!
 :let line=ScreenChar(winwidth(0))
 :call DoRecordScreen()
+:let line="_S_\t bla"
+:$put =line
+:$
+:norm! zt
+:let g:test ="Test 5: set linebreak with conceal and set list and tab displayed by different char (line may not be truncated)"
+:set cpo&vim list linebreak conceallevel=2 concealcursor=nv listchars=tab:ab
+:syn match ConcealVar contained /_/ conceal
+:syn match All /.*/ contains=ConcealVar
+:let line=ScreenChar(winwidth(0))
+:call DoRecordScreen()
 :%w! test.out
 :qa!
 ENDTEST
diff --git a/src/testdir/test_listlbr.ok b/src/testdir/test_listlbr.ok
index be323d4..9b8037f 100644
--- a/src/testdir/test_listlbr.ok
+++ b/src/testdir/test_listlbr.ok
@@ -25,3 +25,10 @@
 +aaaaaaaaaaaaaaaaaa 
 ~                   
 ~                   
+_S_	 bla
+
+Test 5: set linebreak with conceal and set list and tab displayed by different char (line may not be truncated)
+Sabbbbbb bla        
+~                   
+~                   
+~                   
diff --git a/src/version.c b/src/version.c
index d047c9b..31d1b34 100644
--- a/src/version.c
+++ b/src/version.c
@@ -742,6 +742,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    422,
+/**/
     421,
 /**/
     420,