diff --git a/editor/themes/theme_classic.cpp b/editor/themes/theme_classic.cpp
index 77846a8638e..dc8f10af177 100644
--- a/editor/themes/theme_classic.cpp
+++ b/editor/themes/theme_classic.cpp
@@ -2009,6 +2009,19 @@ void ThemeClassic::populate_editor_styles(const Ref<EditorTheme> &p_theme, Edito
 			p_theme->set_stylebox(SceneStringName(panel), "TabContainerOdd", style_content_panel_odd);
 		}
 
+		// TreeLineEdit.
+		{
+			Ref<StyleBoxFlat> tree_line_edit_style = p_theme->get_stylebox(CoreStringName(normal), SNAME("LineEdit"))->duplicate();
+			tree_line_edit_style->set_corner_radius_all(0);
+
+			Ref<StyleBoxFlat> tree_line_edit_style_focus = p_theme->get_stylebox("focus", SNAME("LineEdit"))->duplicate();
+			tree_line_edit_style_focus->set_corner_radius_all(0);
+
+			p_theme->set_type_variation("TreeLineEdit", "LineEdit");
+			p_theme->set_stylebox(CoreStringName(normal), "TreeLineEdit", tree_line_edit_style);
+			p_theme->set_stylebox("focus", "TreeLineEdit", tree_line_edit_style_focus);
+		}
+
 		// EditorValidationPanel.
 		p_theme->set_stylebox(SceneStringName(panel), "EditorValidationPanel", p_config.tree_panel_style);
 
diff --git a/editor/themes/theme_modern.cpp b/editor/themes/theme_modern.cpp
index 0df90299c1d..8e8d6dc90f0 100644
--- a/editor/themes/theme_modern.cpp
+++ b/editor/themes/theme_modern.cpp
@@ -1989,6 +1989,19 @@ void ThemeModern::populate_editor_styles(const Ref<EditorTheme> &p_theme, Editor
 			p_theme->set_stylebox("tabbar_background", "TabContainerOdd", p_theme->get_stylebox(SNAME("tabbar_background"), SNAME("TabContainer")));
 		}
 
+		// TreeLineEdit.
+		{
+			Ref<StyleBoxFlat> tree_line_edit_style = p_theme->get_stylebox(CoreStringName(normal), SNAME("LineEdit"))->duplicate();
+			tree_line_edit_style->set_corner_radius_all(0);
+
+			Ref<StyleBoxFlat> tree_line_edit_style_focus = p_theme->get_stylebox("focus", SNAME("LineEdit"))->duplicate();
+			tree_line_edit_style_focus->set_corner_radius_all(0);
+
+			p_theme->set_type_variation("TreeLineEdit", "LineEdit");
+			p_theme->set_stylebox(CoreStringName(normal), "TreeLineEdit", tree_line_edit_style);
+			p_theme->set_stylebox("focus", "TreeLineEdit", tree_line_edit_style_focus);
+		}
+
 		// EditorValidationPanel.
 		Ref<StyleBoxFlat> editor_validation_panel = p_config.base_style->duplicate();
 		editor_validation_panel->set_bg_color(p_config.surface_low_color);
diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index 8386c446e31..a8db87aeb18 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -6889,6 +6889,7 @@ Tree::Tree() {
 	popup_editor->add_child(popup_editor_vb);
 
 	line_editor = memnew(LineEdit);
+	line_editor->set_theme_type_variation("TreeLineEdit");
 	line_editor->set_v_size_flags(SIZE_EXPAND_FILL);
 	line_editor->hide();
 	popup_editor_vb->add_child(line_editor);