diff --git a/wadsrc/static/zscript/base.txt b/wadsrc/static/zscript/base.txt
index 7fe034f0b..c834dff94 100644
--- a/wadsrc/static/zscript/base.txt
+++ b/wadsrc/static/zscript/base.txt
@@ -639,7 +639,7 @@ enum EPickStart
 // Although String is a builtin type, this is a convenient way to attach methods to it.
 struct StringStruct native
 {
-	native static vararg String Format(String fmt, ...) const;
+	native static vararg String Format(String fmt, ...);
 	native vararg void AppendFormat(String fmt, ...);
 
 	native void Replace(String pattern, String replacement);