diff --git a/tests/throtl/004 b/tests/throtl/004
index 6e286123..d1461b99 100755
--- a/tests/throtl/004
+++ b/tests/throtl/004
@@ -21,16 +21,13 @@ test() {
 	_throtl_set_limits wbps=$((1024 * 1024))
 
 	{
-		sleep 0.1
+		echo "$BASHPID" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
 		_throtl_issue_io write 10M 1
 	} &
 
-	local pid=$!
-	echo "$pid" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
-
 	sleep 0.6
 	echo 0 > "/sys/kernel/config/nullb/$THROTL_DEV/power"
-	wait "$pid"
+	wait $!
 
 	_clean_up_throtl
 	echo "Test complete"
diff --git a/tests/throtl/005 b/tests/throtl/005
index 07782589..86e52b3a 100755
--- a/tests/throtl/005
+++ b/tests/throtl/005
@@ -20,16 +20,13 @@ test() {
 	_throtl_set_limits wbps=$((512 * 1024))
 
 	{
-		sleep 0.1
+		echo "$BASHPID" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
 		_throtl_issue_io write 1M 1
 	} &
 
-	local pid=$!
-	echo "$pid" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
-
 	sleep 1
 	_throtl_set_limits wbps=$((256 * 1024))
-	wait $pid
+	wait $!
 	_throtl_remove_limits
 
 	_clean_up_throtl
diff --git a/tests/throtl/rc b/tests/throtl/rc
index 330e6b93..df54cb91 100644
--- a/tests/throtl/rc
+++ b/tests/throtl/rc
@@ -97,18 +97,15 @@ _throtl_issue_io() {
 # IO and then print time elapsed to the second, blk-throttle limits should be
 # set before this function.
 _throtl_test_io() {
-	local pid
 
 	{
 		local rw=$1
 		local bs=$2
 		local count=$3
 
-		sleep 0.1
+		echo "$BASHPID" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
 		_throtl_issue_io "$rw" "$bs" "$count"
 	} &
 
-	pid=$!
-	echo "$pid" > "$CGROUP2_DIR/$THROTL_DIR/cgroup.procs"
-	wait $pid
+	wait $!
 }