diff --git a/fhem/FHEM/00_CUL.pm b/fhem/FHEM/00_CUL.pm
index eae092d2c..c9083d10f 100755
--- a/fhem/FHEM/00_CUL.pm
+++ b/fhem/FHEM/00_CUL.pm
@@ -4,6 +4,7 @@ package main;
 
 use strict;
 use warnings;
+use DevIo;
 use Time::HiRes qw(gettimeofday);
 
 sub CUL_Attr(@);
@@ -126,8 +127,6 @@ CUL_Initialize($)
 {
   my ($hash) = @_;
 
-  require "$attr{global}{modpath}/FHEM/DevIo.pm";
-
 # Provider
   $hash->{ReadFn}  = "CUL_Read";
   $hash->{WriteFn} = "CUL_Write";
diff --git a/fhem/FHEM/00_ZWDongle.pm b/fhem/FHEM/00_ZWDongle.pm
index 2efc85845..ea00f1436 100644
--- a/fhem/FHEM/00_ZWDongle.pm
+++ b/fhem/FHEM/00_ZWDongle.pm
@@ -5,6 +5,7 @@ package main;
 use strict;
 use warnings;
 use Time::HiRes qw(gettimeofday);
+use DevIo;
 use ZWLib;
 use vars qw($FW_ME);
 
@@ -81,8 +82,6 @@ ZWDongle_Initialize($)
 {
   my ($hash) = @_;
 
-  require "$attr{global}{modpath}/FHEM/DevIo.pm";
-
 # Provider
   $hash->{ReadFn}  = "ZWDongle_Read";
   $hash->{WriteFn} = "ZWDongle_Write";
diff --git a/fhem/FHEM/98_autocreate.pm b/fhem/FHEM/98_autocreate.pm
index 61fa1f781..da787d977 100644
--- a/fhem/FHEM/98_autocreate.pm
+++ b/fhem/FHEM/98_autocreate.pm
@@ -4,6 +4,7 @@ package main;
 
 use strict;
 use warnings;
+use DevIo;
 sub resolveSymLink($);
 
 # Problems:
@@ -566,8 +567,6 @@ CommandUsb($$)
     return "This command is not yet supported on windows";
   }
 
-  require "$attr{global}{modpath}/FHEM/DevIo.pm";
-
   Log3 undef, 1, "usb $n starting";
   ################
   # First try to flash unflashed CULs
diff --git a/fhem/FHEM/DevIo.pm b/fhem/FHEM/DevIo.pm
index 740c5b534..a1101289a 100644
--- a/fhem/FHEM/DevIo.pm
+++ b/fhem/FHEM/DevIo.pm
@@ -3,7 +3,6 @@
 package main;
 
 use strict;
-use warnings;
 
 sub DevIo_CloseDev($@);
 sub DevIo_Disconnected($);