diff --git a/t/src/threads_io.t b/t/src/threads_io.t
index 155960e257..dc37216333 100644
--- a/t/src/threads_io.t
+++ b/t/src/threads_io.t
@@ -6,9 +6,12 @@ use strict;
 use warnings;
 use File::Temp;
 use Time::HiRes qw(sleep);
+use Parrot::Config;
 
-print "1..0 # SKIP non-blocking or threaded I/O not yet implemented\n";
-exit 0;
+unless ( $PConfig{HAS_THREADS} ) {
+    print "1..0 # SKIP non-blocking or threaded I/O not yet implemented\n";
+    exit 0;
+}
 
 # TAP Plan
 print "1..4\n";
@@ -20,27 +23,34 @@ $pir->print(<<'EOF');
 #! ./parrot
 
 .sub main :main
-    .local pmc insub, spinsub, spintask
+    .local pmc insub, intask, spinsub, spintask, counter
+    counter = new ['Integer']
+    counter = 0
+    set_global 'counter', counter
 
     insub = get_global 'insub'
-    $P0 = new 'Task', insub
-    schedule $P0
+    intask = new 'Task', insub
+    setattribute intask, 'data', counter
+    schedule intask
 
     spinsub  = get_global 'spin'
     spintask = new 'Task', spinsub
+    setattribute spintask, 'data', counter
     schedule spintask
 
     pass
 
-    say "ok 2 - main task sleeping"
+    ok_main('main task sleeping', counter)
     sleep 0.5
-    say "ok 4 - main task back"
+    ok_main('main task back', counter)
 
     spintask.'kill'()
 .end
 
 .sub insub
-    .local pmc stdin
+    .param pmc counter
+    .local pmc stdin, interp
+    interp = getinterp
     stdin = getstdin
 
     $P0 = stdin.'readline'()
@@ -51,12 +61,13 @@ $pir->print(<<'EOF');
     .return()
 
 good:
-    say "ok 3 - got input"
+    ok('got input', counter)
     .return()
 .end
 
 .sub spin
-    say "ok 1 - spinning"
+    .param pmc counter
+    ok('spinning', counter)
     $I0 = 0
 spin_more:
     $I0 = $I0 + 1
@@ -65,6 +76,43 @@ spin_more:
     goto spin_more
 .end
 
+.sub ok
+    .param pmc text
+    .param pmc counter
+    .local pmc interp, ok_task, ok_sub
+    ok_sub = get_global 'ok_core'
+    ok_task = new ['Task']
+    setattribute ok_task, 'code', ok_sub
+    setattribute ok_task, 'data', text
+    push ok_task, counter
+    interp = getinterp
+    interp.'schedule_proxied'(ok_task, counter)
+    wait ok_task
+.end
+
+.sub ok_core
+    .param pmc text
+    .local pmc counter, interp, task
+    interp = getinterp
+    task = interp.'current_task'()
+    counter = pop task
+    inc counter
+    print 'ok '
+    print counter
+    print ' - '
+    say text
+.end
+
+.sub ok_main
+    .param pmc text
+    .param pmc counter
+    inc counter
+    print 'ok '
+    print counter
+    print ' - '
+    say text
+.end
+
 EOF
 
 my $pir_file = $pir->filename;