diff --git a/sbr/context_read.c b/sbr/context_read.c
index 8f63fed..b0ec313 100644
--- a/sbr/context_read.c
+++ b/sbr/context_read.c
@@ -65,6 +65,7 @@ context_read (void)
     if ((cp = getenv("MH")) && *cp != '\0') {
 	defpath = path(cp, TFILE);
 
+	setenv("MH", defpath, 1);
 	if (stat(defpath, &st) != -1 && (st.st_mode & S_IFREG) == 0)
 		adios((char *)0, "`%s' specified by your MH environment variable is not a normal file", cp);