diff --git a/ChangeLog b/ChangeLog
index 30d4ba54..17e3f213 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,14 @@
 
 	* NEWS: Version 2.0b.
 
+	* tests/regression.at (Token definitions): Don't rely on
+	AT_PARSER_CHECK for data that contains backslashes.  It currently
+	uses 'echo', and 'echo' isn't portable if its argument contains
+	backslashes.  Problem found on OpenBSD 3.4.  Also, do not assume
+	that the byte '\0xff' is not printable in the C locale; it is,
+	under OpenBSD 3.4 (!).  Luckily, '\0x80' through '\0x9e' are
+	not printable, so use '\0x81' to test.
+
 	* data/glr.c (YYOPTIONAL_LOC): Define even if it's not a recent
 	version of GCC, since the macro is used with non-GCC compilers.
 
diff --git a/tests/regression.at b/tests/regression.at
index de62cdcc..eb85f290 100644
--- a/tests/regression.at
+++ b/tests/regression.at
@@ -345,9 +345,9 @@ int yylex (void);
 %token B_TOKEN "b"
 %token C_TOKEN 'c'
 %token 'd' D_TOKEN
-%token SPECIAL "\\\'\?\"\a\b\f\n\r\t\v\001\377\x001\x0000ff??!"
+%token SPECIAL "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!"
 %%
-exp: "a" "\\\'\?\"\a\b\f\n\r\t\v\001\377\x001\x0000ff??!";
+exp: "a" "\\\'\?\"\a\b\f\n\r\t\v\001\201\x001\x000081??!";
 %%
 void
 yyerror (char const *s)
@@ -370,9 +370,10 @@ main (void)
 
 AT_CHECK([bison -o input.c input.y])
 AT_COMPILE([input])
-AT_PARSER_CHECK([./input], 1, [],
-[syntax error, unexpected "\\'?\"\a\b\f\n\r\t\v\001\377\001\377?\?!", expecting a
-])
+AT_DATA([experr],
+[[syntax error, unexpected "\\'?\"\a\b\f\n\r\t\v\001\201\001\201?\?!", expecting a
+]])
+AT_PARSER_CHECK([./input], 1, [], [experr])
 AT_CLEANUP