diff --git a/M2/Macaulay2/m2/code.m2 b/M2/Macaulay2/m2/code.m2
index edf6ddffc1..f6aecdffb9 100644
--- a/M2/Macaulay2/m2/code.m2
+++ b/M2/Macaulay2/m2/code.m2
@@ -57,7 +57,7 @@ code FilePosition := x -> (
      (
 	  wp := set characters " \t\r);";
 	  file := (
-	       if match("startup.m2.in$", filename) then startupString
+	       if match("startup\\.m2\\.in$", filename) then startupString
 	       else if filename === "currentString" then (
 		    if currentString === null
 		    then error "code no longer available"