diff --git a/ChangeLog b/ChangeLog
index 00e4bdbd5..95b5b6bfd 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -2,6 +2,8 @@
  - (djm) [regress/Makefile] use $TEST_SSH_KEYGEN instead of the one in
    $PATH, fix cleanup of droppings; reported by openssh AT
    roumenpetrov.info; ok dtucker@
+ - (djm) [regress/agent-ptrace.sh] Fix false failure on OS X by adding
+   its unique snowflake of a gdb error to the ones we look for.
 
 20110116
  - (dtucker) [Makefile.in configure.ac regress/kextype.sh] Skip sha256-based
diff --git a/regress/agent-ptrace.sh b/regress/agent-ptrace.sh
index d5892ed03..9f29464c5 100644
--- a/regress/agent-ptrace.sh
+++ b/regress/agent-ptrace.sh
@@ -41,7 +41,7 @@ EOF
 	if [ $? -ne 0 ]; then
 		fail "gdb failed: exit code $?"
 	fi
-	egrep 'ptrace: Operation not permitted.|procfs:.*Permission denied.|ttrace.*Permission denied.|procfs:.*: Invalid argument.' >/dev/null ${OBJ}/gdb.out
+	egrep 'ptrace: Operation not permitted.|procfs:.*Permission denied.|ttrace.*Permission denied.|procfs:.*: Invalid argument.|Unable to access task ' >/dev/null ${OBJ}/gdb.out
 	r=$?
 	rm -f ${OBJ}/gdb.out
 	if [ $r -ne 0 ]; then