diff --git a/src/sync/export_test.go b/src/sync/export_test.go
index 10d3599..ffbe567 100644
--- a/src/sync/export_test.go
+++ b/src/sync/export_test.go
@@ -18,9 +18,13 @@
 }
 
 func NewPoolDequeue(n int) PoolDequeue {
-	return &poolDequeue{
+	d := &poolDequeue{
 		vals: make([]eface, n),
 	}
+	// For testing purposes, set the head and tail indexes close
+	// to wrapping around.
+	d.headTail = d.pack(1<<dequeueBits-500, 1<<dequeueBits-500)
+	return d
 }
 
 func (d *poolDequeue) PushHead(val interface{}) bool {
diff --git a/src/sync/pool_test.go b/src/sync/pool_test.go
index ff1174c..090f1a8 100644
--- a/src/sync/pool_test.go
+++ b/src/sync/pool_test.go
@@ -173,9 +173,7 @@
 
 func testPoolDequeue(t *testing.T, d PoolDequeue) {
 	const P = 10
-	// In long mode, do enough pushes to wrap around the 21-bit
-	// indexes.
-	N := 1<<21 + 1000
+	var N int = 2e6
 	if testing.Short() {
 		N = 1e3
 	}