diff --git a/m4/ChangeLog b/m4/ChangeLog
index 9ed0d91f7..ae2c584df 100644
--- a/m4/ChangeLog
+++ b/m4/ChangeLog
@@ -1,3 +1,9 @@
+2006-07-11  David Shaw  <dshaw@jabberwocky.com>
+
+	* tar-ustar.m4: Pass tar data through strings so that greps that
+	don't grep in binary files (Solaris) can detect the string.  Noted
+	by Mark Davies.
+
 2006-06-25  Werner Koch  <wk@g10code.com>
 
 	* Makefile.am: Added noexecstack.m4 and ldap.m4
diff --git a/m4/tar-ustar.m4 b/m4/tar-ustar.m4
index 8b3d01457..7cc1c8926 100644
--- a/m4/tar-ustar.m4
+++ b/m4/tar-ustar.m4
@@ -27,7 +27,7 @@ AC_DEFUN([GNUPG_CHECK_USTAR],
      if test x$_mytar != x ; then
         AC_MSG_CHECKING([whether $_mytar speaks USTAR])
         echo hithere > conftest.txt
-        $_mytar -cf - conftest.txt | grep -q ustar
+        $_mytar -cf - conftest.txt | strings | grep -q ustar
         _tar_bad=$?
         rm conftest.txt