diff --git a/xCAT-server/share/xcat/netboot/rh/genimage b/xCAT-server/share/xcat/netboot/rh/genimage
index 53708a697..372f64577 100755
--- a/xCAT-server/share/xcat/netboot/rh/genimage
+++ b/xCAT-server/share/xcat/netboot/rh/genimage
@@ -169,6 +169,12 @@ foreach (split /,/,$netdriver) {
    push @ndrivers, $_;
 }
 
+foreach (@ndrivers) {
+   unless (/\.ko$/) {
+      s/$/.ko/;
+   }
+}
+
 unless ($onlyinitrd) {
    @yumdirs=();
    find(\&isyumdir, <$installroot/$osver/$arch/>);
diff --git a/xCAT-server/share/xcat/netboot/sles/genimage b/xCAT-server/share/xcat/netboot/sles/genimage
index 19834409f..09e381510 100755
--- a/xCAT-server/share/xcat/netboot/sles/genimage
+++ b/xCAT-server/share/xcat/netboot/sles/genimage
@@ -172,6 +172,12 @@ foreach (split /,/,$netdriver) {
     }
 }
 
+foreach (@ndrivers) {
+   unless (/\.ko$/) {
+      s/$/.ko/;
+   }
+}
+
 unless (grep /af_packet/,@ndrivers) {
     unshift(@ndrivers,"af_packet.ko");
 }