diff --git a/src/spell.c b/src/spell.c
index d866a2d..24abce4 100644
--- a/src/spell.c
+++ b/src/spell.c
@@ -3996,9 +3996,10 @@
 		    n = arridx[depth] + curi[depth];
 		    ++curi[depth];
 		    c = byts[n];
-		    if (c == 0)
+		    if (c == 0 || depth >= MAXWLEN - 1)
 		    {
-			// End of word, deal with the word.
+			// End of word or reached maximum length, deal with the
+			// word.
 			// Don't use keep-case words in the fold-case tree,
 			// they will appear in the keep-case tree.
 			// Only use the word when the region matches.
diff --git a/src/testdir/test_spell.vim b/src/testdir/test_spell.vim
index d3f56d8..a291eb5 100644
--- a/src/testdir/test_spell.vim
+++ b/src/testdir/test_spell.vim
@@ -285,6 +285,18 @@
   bwipe!
 endfunc
 
+func Test_spell_dump_word_length()
+  " this was running over MAXWLEN
+  new
+  noremap 0 0a0zW0000000
+  sil! norm 0z=0
+  sil norm 0000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
+  sil! norm 0z=0
+
+  bwipe!
+  nunmap 0
+endfunc
+
 " Test spellsuggest({word} [, {max} [, {capital}]])
 func Test_spellsuggest()
   " Verify suggestions are given even when spell checking is not enabled.
diff --git a/src/version.c b/src/version.c
index 180a4cf..e22fb56 100644
--- a/src/version.c
+++ b/src/version.c
@@ -736,6 +736,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    35,
+/**/
     34,
 /**/
     33,