diff --git a/plugins/disk/btrfs_device_stats b/plugins/disk/btrfs_device_stats
index bd145024..533a911f 100755
--- a/plugins/disk/btrfs_device_stats
+++ b/plugins/disk/btrfs_device_stats
@@ -95,7 +95,8 @@ def munin_config(fs):
     for this_device in devices:
         this_dev_info = fs.dev_info(this_device.devid)
         this_dev_name = this_dev_info.path.replace('/dev/', '')
-        print("multigraph btrfs_device_stats_" + fsid + "." + str(this_device.devid))
+        print("multigraph btrfs_device_stats_" + fsid + "." +
+              str(this_device.devid))
         print("graph_args --base 1000 -l 0")
         print("graph_vlabel btrfs attribute value")
         print("graph_title btrfs device stats for " + this_dev_name)
@@ -103,36 +104,50 @@ def munin_config(fs):
         print("graph_info This graph shows stats of devices used by btrfs")
 
         print("corruption_errs.label Corruption Errors")
-        print("corruption_errs.warning " + os.getenv('corruption_errs_warning', default = str(warning)))
+        print("corruption_errs.warning " + os.getenv('corruption_errs_warning',
+              default = str(warning)))
         if os.getenv('corruption_errs_critical', default = critical) != False:
-            print("corruption_errs.critical " + os.getenv('corruption_errs_critical', default = str(critical)))
+            print("corruption_errs.critical " +
+                  os.getenv('corruption_errs_critical',
+                  default = str(critical)))
 
         print("flush_errs.label Flush Errors")
-        print("flush_errs.warning " + os.getenv('flush_errs_warning', default = str(warning)))
+        print("flush_errs.warning " + os.getenv('flush_errs_warning',
+              default = str(warning)))
         if os.getenv('flush_errs_critical', default = critical) != False:
-            print("flush_errs.critical " + os.getenv('flush_errs_critical', default = str(critical)))
+            print("flush_errs.critical " + os.getenv('flush_errs_critical',
+                  default = str(critical)))
 
         print("generation_errs.label Generation Errors")
-        print("generation_errs.warning " + os.getenv('generation_errs_warning', default = str(warning)))
+        print("generation_errs.warning " + os.getenv('generation_errs_warning',
+              default = str(warning)))
         if os.getenv('generation_errs_critical', default = critical) != False:
-            print("generation_errs.critical " + os.getenv('generation_errs_critical', default = str(critical)))
+            print("generation_errs.critical " +
+                  os.getenv('generation_errs_critical',
+                  default = str(critical)))
 
         print("read_errs.label Read Errors")
-        print("read_errs.warning " + os.getenv('read_errs_warning', default = str(warning)))
+        print("read_errs.warning " + os.getenv('read_errs_warning',
+              default = str(warning)))
         if os.getenv('read_errs_critical', default = critical) != False:
-            print("read_errs.critical " + os.getenv('read_errs_critical', default = str(critical)))
+            print("read_errs.critical " + os.getenv('read_errs_critical',
+                  default = str(critical)))
 
         print("write_errs.label Write Errors")
-        print("write_errs.warning " + os.getenv('write_errs_warning', default = str(warning)))
+        print("write_errs.warning " + os.getenv('write_errs_warning',
+              default = str(warning)))
         if os.getenv('write_errs_critical', default = critical) != False:
-            print("write_errs.critical " + os.getenv('write_errs_critical', default = str(critical)))
+            print("write_errs.critical " + os.getenv('write_errs_critical',
+                  default = str(critical)))
 
         print("nr_items.label Nr. of Items")
 
         print("flags.label Nr. of Flags")
-        print("flags.warning " + os.getenv('flags_warning', default = str(warning)))
+        print("flags.warning " + os.getenv('flags_warning',
+              default = str(warning)))
         if os.getenv('flags_critical', default = critical) != False:
-            print("flags.critical " + os.getenv('flags_critical', default = str(critical)))
+            print("flags.critical " + os.getenv('flags_critical',
+                  default = str(critical)))
 
         print("")
 
@@ -168,7 +183,8 @@ def munin_values(fs):
         nr_items_total = nr_items_total + nr_items
         flags_total = flags_total + flags
 
-        print("multigraph btrfs_device_stats_" + fsid + "." + str(this_device.devid))
+        print("multigraph btrfs_device_stats_" + fsid + "." +
+              str(this_device.devid))
 
         print("corruption_errs.value " + str(corruption_errs))
         print("flush_errs.value " + str(flush_errs))
diff --git a/plugins/disk/btrfs_device_usage b/plugins/disk/btrfs_device_usage
index d422120a..9cf91217 100755
--- a/plugins/disk/btrfs_device_usage
+++ b/plugins/disk/btrfs_device_usage
@@ -77,13 +77,17 @@ def munin_config(fs):
 
     byte_warning = os.getenv('byte_warning', default = False)
     byte_critical = os.getenv('byte_critical', default = False)
-    byte_warning = os.getenv('byte_' + fsid + '_warning', default = byte_warning)
-    byte_critical = os.getenv('byte_' + fsid + '_critical', default = byte_critical)
+    byte_warning = os.getenv('byte_' + fsid + '_warning',
+                             default = byte_warning)
+    byte_critical = os.getenv('byte_' + fsid + '_critical',
+                              default = byte_critical)
 
     percent_warning = os.getenv('percent_warning', default = 95)
     percent_critical = os.getenv('percent_critical', default = 98)
-    percent_warning = os.getenv('percent_' + fsid + '_warning', default = percent_warning)
-    percent_critical = os.getenv('percent_' + fsid + '_critical', default = percent_critical)
+    percent_warning = os.getenv('percent_' + fsid + '_warning',
+                                default = percent_warning)
+    percent_critical = os.getenv('percent_' + fsid + '_critical',
+                                 default = percent_critical)
 
     print("multigraph btrfs_device_usage_byte_" + fsid)
     print("graph_title btrfs usage by device in bytes on " + fs.path)