diff --git a/src/company_gui.cpp b/src/company_gui.cpp
--- a/src/company_gui.cpp
+++ b/src/company_gui.cpp
@@ -735,7 +735,7 @@ private:
 					GetString(last_name[1], STR_GROUP_NAME, lastof(last_name[1]));
 				}
 
-				int r = strnatcmp(last_name[0], last_name[1]); // Sort by name (natural sorting).
+				int r = StrNaturalCompare(last_name[0], last_name[1]); // Sort by name (natural sorting).
 				if (r == 0) return a->index < b->index;
 				return r < 0;
 			});