diff --git a/aegisub/auto4_auto3.cpp b/aegisub/auto4_auto3.cpp
index 411e58e75..e0a4f738c 100644
--- a/aegisub/auto4_auto3.cpp
+++ b/aegisub/auto4_auto3.cpp
@@ -1452,6 +1452,6 @@ continue_invalid_option:
 			}
 		}
 	};
-	Auto3ScriptFactory _script_factory;
+	Auto3ScriptFactory _auto3_script_factory;
 
 };
diff --git a/aegisub/auto4_lua.cpp b/aegisub/auto4_lua.cpp
index 5aeda3dd5..8a9900b96 100644
--- a/aegisub/auto4_lua.cpp
+++ b/aegisub/auto4_lua.cpp
@@ -890,6 +890,6 @@ namespace Automation4 {
 			}
 		}
 	};
-	LuaScriptFactory _script_factory;
+	LuaScriptFactory _lua_script_factory;
 
 };
diff --git a/aegisub/auto4_ruby.cpp b/aegisub/auto4_ruby.cpp
index 6aa88dba3..d305c68e9 100644
--- a/aegisub/auto4_ruby.cpp
+++ b/aegisub/auto4_ruby.cpp
@@ -484,7 +484,7 @@ namespace Automation4 {
 			}
 		}
 	};
-	RubyScriptFactory _script_factory;
+	RubyScriptFactory _ruby_script_factory;
 
 	RubyObjects::RubyObjects()
 	{