diff --git a/src/evalvars.c b/src/evalvars.c
index 7fb190c..42b7ef5 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -3508,7 +3508,9 @@
     char_u	nbuf[NUMBUFLEN];
     int		error = FALSE;
 
-    if (!in_vim9script() || varp->v_type != VAR_STRING)
+    if (varp->v_type == VAR_BOOL)
+	numval = (long)varp->vval.v_number;
+    else if (!in_vim9script() || varp->v_type != VAR_STRING)
 	numval = (long)tv_get_number_chk(varp, &error);
     strval = tv_get_string_buf_chk(varp, nbuf);
     if (!error && strval != NULL)