diff --git a/helix-term/src/commands.rs b/helix-term/src/commands.rs
index bc8e6530..59ca2e3b 100644
--- a/helix-term/src/commands.rs
+++ b/helix-term/src/commands.rs
@@ -2948,7 +2948,7 @@ pub mod insert {
                 let line_start_pos = text.line_to_char(range.cursor_line(text));
                 // consider to delete by indent level if all characters before `pos` are indent units.
                 let fragment = Cow::from(text.slice(line_start_pos..pos));
-                if !fragment.is_empty() && fragment.chars().all(|ch| ch.is_whitespace()) {
+                if !fragment.is_empty() && fragment.chars().all(|ch| ch == ' ' || ch == '\t') {
                     if text.get_char(pos.saturating_sub(1)) == Some('\t') {
                         // fast path, delete one char
                         (