diff --git a/drd/tests/pth_detached.c b/drd/tests/pth_detached.c
index f3025c162..f755a8c81 100644
--- a/drd/tests/pth_detached.c
+++ b/drd/tests/pth_detached.c
@@ -80,6 +80,7 @@ int main(int argc, char** argv)
   pthread_mutex_destroy(&s_mutex);
 
   write(STDOUT_FILENO, "\n", 1);
+  fprintf(stderr, "Done.\n");
 
   return 0;
 }
diff --git a/drd/tests/pth_detached.stderr.exp b/drd/tests/pth_detached.stderr.exp
index d18786f80..d16127fb5 100644
--- a/drd/tests/pth_detached.stderr.exp
+++ b/drd/tests/pth_detached.stderr.exp
@@ -1,3 +1,4 @@
 
+Done.
 
 ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
diff --git a/drd/tests/pth_detached.stdout.exp b/drd/tests/pth_detached.stdout.exp
index f3229c5b9..e69de29bb 100644
--- a/drd/tests/pth_detached.stdout.exp
+++ b/drd/tests/pth_detached.stdout.exp
@@ -1 +0,0 @@
-..
diff --git a/drd/tests/pth_detached.vgtest b/drd/tests/pth_detached.vgtest
index f78b9ccba..e91ae8e53 100644
--- a/drd/tests/pth_detached.vgtest
+++ b/drd/tests/pth_detached.vgtest
@@ -1,3 +1,4 @@
 prereq: ./supported_libpthread
 prog: pth_detached
 args: 1 1
+stdout_filter: ../../tests/filter_sink
diff --git a/drd/tests/pth_detached2.stderr.exp b/drd/tests/pth_detached2.stderr.exp
index d18786f80..d16127fb5 100644
--- a/drd/tests/pth_detached2.stderr.exp
+++ b/drd/tests/pth_detached2.stderr.exp
@@ -1,3 +1,4 @@
 
+Done.
 
 ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)
diff --git a/drd/tests/pth_detached2.stdout.exp b/drd/tests/pth_detached2.stdout.exp
index 01bfb0256..e69de29bb 100644
--- a/drd/tests/pth_detached2.stdout.exp
+++ b/drd/tests/pth_detached2.stdout.exp
@@ -1 +0,0 @@
-....................
diff --git a/drd/tests/pth_detached2.vgtest b/drd/tests/pth_detached2.vgtest
index bcd950a6d..aec7a8346 100644
--- a/drd/tests/pth_detached2.vgtest
+++ b/drd/tests/pth_detached2.vgtest
@@ -2,3 +2,4 @@ prereq: ./supported_libpthread
 vgopts: --read-var-info=yes
 prog: pth_detached
 args: 10 10
+stdout_filter: ../../tests/filter_sink