diff --git a/src/map.c b/src/map.c
index 6a994d4..b46ba37 100644
--- a/src/map.c
+++ b/src/map.c
@@ -2307,7 +2307,7 @@
     if (which == NULL)
 	return;
     mode = get_map_mode(&which, 0);
-    is_abbr = (int)tv_get_number(&argvars[1]);
+    is_abbr = (int)tv_get_bool(&argvars[1]);
 
     if (argvars[2].v_type != VAR_DICT)
     {
diff --git a/src/testdir/test_vim9_func.vim b/src/testdir/test_vim9_func.vim
index eec5af6..509c7fa 100644
--- a/src/testdir/test_vim9_func.vim
+++ b/src/testdir/test_vim9_func.vim
@@ -1721,6 +1721,14 @@
   iunabbrev foo
 enddef
 
+def Test_maparg_mapset()
+  nnoremap <F3> :echo "hit F3"<CR>
+  var mapsave = maparg('<F3>', 'n', false, true)
+  mapset('n', false, mapsave)
+
+  nunmap <F3>
+enddef
+
 def Test_nr2char()
   nr2char(97, true)->assert_equal('a')
 enddef
diff --git a/src/version.c b/src/version.c
index 0127186..9619a33 100644
--- a/src/version.c
+++ b/src/version.c
@@ -751,6 +751,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1782,
+/**/
     1781,
 /**/
     1780,