diff --git a/config/ChangeLog b/config/ChangeLog
index c4b456287..7b6ded03d 100644
--- a/config/ChangeLog
+++ b/config/ChangeLog
@@ -8,6 +8,10 @@
 
 	* largefile.m4: New file.
 
+2009-10-23  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>
+
+	* acx.m4 (ACX_CHECK_CYGWIN_CAT_WORKS): Use = with test.
+
 2009-09-09  Paolo Bonzini  <bonzini@gnu.org>
 
 	* stdint.m4 (GCC_HEADER_STDINT): Revert changes to this macro in
diff --git a/config/acx.m4 b/config/acx.m4
index cea08b720..b559c03eb 100644
--- a/config/acx.m4
+++ b/config/acx.m4
@@ -605,7 +605,7 @@ dnl # See binutils PR 4334 for more details.
 AC_DEFUN([ACX_CHECK_CYGWIN_CAT_WORKS],[
 AC_MSG_CHECKING([to see if cat works as expected])
 echo a >cygwin-cat-check
-if test `cat cygwin-cat-check` == a ; then
+if test `cat cygwin-cat-check` = a ; then
   rm cygwin-cat-check
   AC_MSG_RESULT(yes)
 else