diff --git a/CHANGES b/CHANGES
index 54fdc36..99f4ee2 100644
--- a/CHANGES
+++ b/CHANGES
@@ -8,6 +8,10 @@ corrections:
 
 	configure option --enable-msglevel did not work with numbers
 
+	The autoconf mechanism for determining SHIFT_OFFSET did not work when
+	cross compiling.
+	Thanks to Max Freisinger from Gentoo for seinding a patch.
+
 git:
 	Added missing Config/Makefile.DragonFly-2-8-2,
 	Config/config.DragonFly-2-8-2.h
diff --git a/configure.in b/configure.in
index 5115e5e..82b8e68 100644
--- a/configure.in
+++ b/configure.in
@@ -998,11 +998,11 @@ AC_CACHE_VAL(ac_cv_ispeed_offset,
  ],
  [ac_cv_ispeed_offset=`cat $conftestspeedoff`],
  [ac_cv_ispeed_offset=-1],
- [ac_cv_ispeed_offset=-1]	#!
+ [ac_cv_ispeed_offset="((unsigned long)&((struct termios *)0)->c_ispeed / sizeof(speed_t))"]
 )])
 LIBS="$LIBS1"
 AC_MSG_RESULT($ac_cv_ispeed_offset)
- if test $ac_cv_ispeed_offset -ge 0; then
+ if test "$ac_cv_ispeed_offset" != -1; then
    AC_DEFINE_UNQUOTED(ISPEED_OFFSET, $ac_cv_ispeed_offset)
  fi
 fi