diff --git a/src/company_gui.cpp b/src/company_gui.cpp
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -672,7 +672,7 @@ private:
 			AddChildren(&list, INVALID_GROUP, 0);
 		}
 
-		this->groups.Compact();
+		this->groups.shrink_to_fit();
 		this->groups.RebuildDone();
 	}