diff --git a/pvshrink b/pvshrink
index b2481aa..9990c52 100755
--- a/pvshrink
+++ b/pvshrink
@@ -48,7 +48,7 @@ while True:
     used_blocks = []
 
     try:
-        pvs = subprocess.check_output(['pvs','--segments','-o','lv_name,pv_segstart,pv_segsize','--separator',',','--noheadings',device])
+        pvs = subprocess.check_output(['pvs','--segments','-o','lv_name,pv_segstart,pv_segsize','--separator',',','--noheadings',device]).decode('utf-8')
     except subprocess.CalledProcessError as exc:
         die("Error calling pvs (%d)" % exc.returncode)
 
@@ -113,7 +113,7 @@ while True:
     total_segments_moved = total_segments_moved + size
     print("%d of %d (%.2f%%) done" % (total_segments_moved, total_segments_to_move, 100*float(total_segments_moved)/float(total_segments_to_move)))
 
-pvck = subprocess.check_output(['pvck', device])
+pvck = subprocess.check_output(['pvck', device]).decode('utf-8')
 
 match = re.search(r'Found text metadata area: offset=(\d+), size=(\d+)', pvck)
 if match is None:
@@ -123,7 +123,7 @@ if match is None:
 metadata_size = int(match.group(1)) + int(match.group(2))
 print("Metadata size: %d b" % metadata_size)
 
-pvdisplay = subprocess.check_output(['pvdisplay','--units','b', device])
+pvdisplay = subprocess.check_output(['pvdisplay','--units','b', device]).decode('utf-8')
 
 match = re.search(r'PE Size\s*(\d+)', pvdisplay)
 if match is None: