diff --git a/common/rc b/common/rc
index c31538de..610045ea 100644
--- a/common/rc
+++ b/common/rc
@@ -3003,6 +3003,16 @@ _short_dev()
 	echo `basename $(_real_dev $1)`
 }
 
+_sysfs_dev()
+{
+	local _dev=$1
+	local _maj=$(stat -c%t $_dev | tr [:lower:] [:upper:])
+	local _min=$(stat -c%T $_dev | tr [:lower:] [:upper:])
+	_maj=$(echo "ibase=16; $_maj" | bc)
+	_min=$(echo "ibase=16; $_min" | bc)
+	echo /sys/dev/block/$_maj:$_min
+}
+
 get_block_size()
 {
 	if [ -z $1 ] || [ ! -d $1 ]; then
diff --git a/tests/btrfs/088 b/tests/btrfs/088
index 8206ecce..ca11c253 100755
--- a/tests/btrfs/088
+++ b/tests/btrfs/088
@@ -53,19 +53,19 @@ _require_scratch
 _require_fail_make_request
 _need_to_be_root
 
-SCRATCH_BDEV=`_short_dev $SCRATCH_DEV`
+SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV`
 
 enable_io_failure()
 {
 	echo 100 > $DEBUGFS_MNT/fail_make_request/probability
 	echo 1000 > $DEBUGFS_MNT/fail_make_request/times
 	echo 0 > $DEBUGFS_MNT/fail_make_request/verbose
-	echo 1 > /sys/block/$SCRATCH_BDEV/make-it-fail
+	echo 1 > $SYSFS_BDEV/make-it-fail
 }
 
 disable_io_failure()
 {
-	echo 0 > /sys/block/$SCRATCH_BDEV/make-it-fail
+	echo 0 > $SYSFS_BDEV/make-it-fail
 	echo 0 > $DEBUGFS_MNT/fail_make_request/probability
 	echo 0 > $DEBUGFS_MNT/fail_make_request/times
 }
diff --git a/tests/generic/019 b/tests/generic/019
index b3875071..ca196ca5 100755
--- a/tests/generic/019
+++ b/tests/generic/019
@@ -41,7 +41,7 @@ _need_to_be_root
 _require_scratch
 _require_fail_make_request
 
-SCRATCH_BDEV=`_short_dev $SCRATCH_DEV`
+SYSFS_BDEV=`_sysfs_dev $SCRATCH_DEV`
 
 allow_fail_make_request()
 {
@@ -61,17 +61,15 @@ disallow_fail_make_request()
 start_fail_scratch_dev()
 {
     echo "Force SCRATCH_DEV device failure"
-    echo " echo 1 > /sys/block/$SCRATCH_BDEV/make-it-fail" >> $seqres.full
-    echo 1 > /sys/block/$SCRATCH_BDEV/make-it-fail
-
+    echo " echo 1 > $SYSFS_BDEV/make-it-fail" >> $seqres.full
+    echo 1 > $SYSFS_BDEV/make-it-fail
 }
 
 stop_fail_scratch_dev()
 {
     echo "Make SCRATCH_DEV device operable again"
-    echo " echo 0 > /sys/block/$SCRATCH_BDEV/make-it-fail" >> $seqres.full
-    echo 0 > /sys/block/$SCRATCH_BDEV/make-it-fail
-
+    echo " echo 0 > $SYSFS_BDEV/make-it-fail" >> $seqres.full
+    echo 0 > $SYSFS_BDEV/make-it-fail
 }
 
 _cleanup()