diff --git a/doc/classes/PopupDialog.xml b/doc/classes/PopupDialog.xml
index d85f568abf3..939453b9777 100644
--- a/doc/classes/PopupDialog.xml
+++ b/doc/classes/PopupDialog.xml
@@ -12,4 +12,9 @@
 	</methods>
 	<constants>
 	</constants>
+	<theme_items>
+		<theme_item name="panel" type="StyleBox">
+			Sets a custom [StyleBox] for the panel of the [PopupDialog].
+		</theme_item>
+	</theme_items>
 </class>
diff --git a/editor/editor_themes.cpp b/editor/editor_themes.cpp
index 0c7c2c6cc3a..a49c3eac736 100644
--- a/editor/editor_themes.cpp
+++ b/editor/editor_themes.cpp
@@ -648,9 +648,11 @@ Ref<Theme> create_editor_theme(const Ref<Theme> p_theme) {
 	theme->set_constant("hseparation", "CheckBox", 4 * EDSCALE);
 	theme->set_constant("check_vadjust", "CheckBox", 0 * EDSCALE);
 
+	// PopupDialog
+	theme->set_stylebox("panel", "PopupDialog", style_popup);
+
 	// PopupMenu
-	Ref<StyleBoxFlat> style_popup_menu = style_popup;
-	theme->set_stylebox("panel", "PopupMenu", style_popup_menu);
+	theme->set_stylebox("panel", "PopupMenu", style_popup);
 	theme->set_stylebox("separator", "PopupMenu", style_popup_separator);
 	theme->set_stylebox("labeled_separator_left", "PopupMenu", style_popup_labeled_separator_left);
 	theme->set_stylebox("labeled_separator_right", "PopupMenu", style_popup_labeled_separator_right);
diff --git a/scene/gui/dialogs.cpp b/scene/gui/dialogs.cpp
index 31551d62570..062089d80b5 100644
--- a/scene/gui/dialogs.cpp
+++ b/scene/gui/dialogs.cpp
@@ -356,7 +356,7 @@ void PopupDialog::_notification(int p_what) {
 
 	if (p_what == NOTIFICATION_DRAW) {
 		RID ci = get_canvas_item();
-		get_stylebox("panel", "PopupMenu")->draw(ci, Rect2(Point2(), get_size()));
+		get_stylebox("panel")->draw(ci, Rect2(Point2(), get_size()));
 	}
 }
 
diff --git a/scene/resources/default_theme/default_theme.cpp b/scene/resources/default_theme/default_theme.cpp
index 1a053a18c93..e82819f2709 100644
--- a/scene/resources/default_theme/default_theme.cpp
+++ b/scene/resources/default_theme/default_theme.cpp
@@ -558,9 +558,14 @@ void fill_default_theme(Ref<Theme> &theme, const Ref<Font> &default_font, const
 
 	theme->set_stylebox("panel", "PopupPanel", style_pp);
 
+	// PopupDialog
+
+	Ref<StyleBoxTexture> style_pd = make_stylebox(popup_bg_png, 4, 4, 4, 4, 10, 10, 10, 10);
+	theme->set_stylebox("panel", "PopupDialog", style_pd);
+
 	// PopupMenu
 
-	theme->set_stylebox("panel", "PopupMenu", make_stylebox(popup_bg_png, 4, 4, 4, 4, 10, 10, 10, 10));
+	theme->set_stylebox("panel", "PopupMenu", style_pd);
 	theme->set_stylebox("panel_disabled", "PopupMenu", make_stylebox(popup_bg_disabled_png, 4, 4, 4, 4));
 	theme->set_stylebox("hover", "PopupMenu", selected);
 	theme->set_stylebox("separator", "PopupMenu", make_stylebox(vseparator_png, 3, 3, 3, 3));