diff --git a/doc/classes/Tree.xml b/doc/classes/Tree.xml
index a1932ba5b68..004e93ac046 100644
--- a/doc/classes/Tree.xml
+++ b/doc/classes/Tree.xml
@@ -606,6 +606,9 @@
 		<theme_item name="font_size" data_type="font_size" type="int">
 			Font size of the item's text.
 		</theme_item>
+		<theme_item name="title_button_font_size" data_type="font_size" type="int">
+			Font size of the title button's text.
+		</theme_item>
 		<theme_item name="arrow" data_type="icon" type="Texture2D">
 			The arrow icon used when a foldable item is not collapsed.
 		</theme_item>
diff --git a/scene/gui/tree.cpp b/scene/gui/tree.cpp
index 433ae656ba3..3c1be2d5fe6 100644
--- a/scene/gui/tree.cpp
+++ b/scene/gui/tree.cpp
@@ -1922,7 +1922,7 @@ void Tree::update_column(int p_col) {
 		columns.write[p_col].text_buf->set_direction((TextServer::Direction)columns[p_col].text_direction);
 	}
 
-	columns.write[p_col].text_buf->add_string(columns[p_col].title, theme_cache.font, theme_cache.font_size, columns[p_col].language);
+	columns.write[p_col].text_buf->add_string(columns[p_col].title, theme_cache.tb_font, theme_cache.tb_font_size, columns[p_col].language);
 	columns.write[p_col].cached_minimum_width_dirty = true;
 }
 
@@ -4108,7 +4108,7 @@ void Tree::update_scrollbars() {
 }
 
 int Tree::_get_title_button_height() const {
-	ERR_FAIL_COND_V(theme_cache.font.is_null() || theme_cache.title_button.is_null(), 0);
+	ERR_FAIL_COND_V(theme_cache.tb_font.is_null() || theme_cache.title_button.is_null(), 0);
 	int h = 0;
 	if (show_column_titles) {
 		for (int i = 0; i < columns.size(); i++) {
@@ -4243,7 +4243,6 @@ void Tree::_notification(int p_what) {
 				int ofs2 = theme_cache.panel_style->get_margin(SIDE_LEFT);
 				for (int i = 0; i < columns.size(); i++) {
 					Ref<StyleBox> sb = (cache.click_type == Cache::CLICK_TITLE && cache.click_index == i) ? theme_cache.title_button_pressed : ((cache.hover_type == Cache::CLICK_TITLE && cache.hover_index == i) ? theme_cache.title_button_hover : theme_cache.title_button);
-					Ref<Font> f = theme_cache.tb_font;
 					Rect2 tbrect = Rect2(ofs2 - theme_cache.offset.x, bg->get_margin(SIDE_TOP), get_column_width(i), tbh);
 					if (cache.rtl) {
 						tbrect.position.x = get_size().width - tbrect.size.x - tbrect.position.x;
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index d6b0fe797f2..eef46a6798e 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -762,6 +762,7 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 	theme->set_font("title_button_font", "Tree", Ref<Font>());
 	theme->set_font("font", "Tree", Ref<Font>());
 	theme->set_font_size("font_size", "Tree", -1);
+	theme->set_font_size("title_button_font_size", "Tree", -1);
 
 	theme->set_color("title_button_color", "Tree", control_font_color);
 	theme->set_color("font_color", "Tree", control_font_low_color);