diff --git a/jam/jam.h b/jam/jam.h
index a63d260851..4d382d843c 100644
--- a/jam/jam.h
+++ b/jam/jam.h
@@ -464,7 +464,7 @@
  */
 
 # ifndef MAXLINE
-# define MAXLINE 200000	/* longest 'together' actions' */
+# define MAXLINE 100000	/* longest 'together' actions' */
 # endif
 
 # ifndef EXITOK