diff --git a/scene/gui/separator.cpp b/scene/gui/separator.cpp
index 3db234f7cc8..55d837458a1 100644
--- a/scene/gui/separator.cpp
+++ b/scene/gui/separator.cpp
@@ -32,7 +32,11 @@
 Size2 Separator::get_minimum_size() const {
 
 	Size2 ms(3, 3);
-	ms[orientation] = get_constant("separation");
+	if (orientation == VERTICAL) {
+		ms.x = get_constant("separation");
+	} else { // HORIZONTAL
+		ms.y = get_constant("separation");
+	}
 	return ms;
 }