diff --git a/latexdiff b/latexdiff
index 0a9750a..327c6d8 100755
--- a/latexdiff
+++ b/latexdiff
@@ -1331,7 +1331,7 @@ if ( defined $packages{"siunitx"} ) {
   # protect SI command by surrounding them with an \mbox
   # this is done to get around an incompatibility between the ulem and siunitx package
   print STDERR "siunitx package detected.\n" if $verbose;
-  my $mboxcmds = 'SI,ang,numlist,numrange,SIlist,SIrange,qty,qtylist,qtyproduct,qtyrange,complexqty';
+  my $mboxcmds = 'SI,ang,numlist,numrange,SIlist,SIrange,qty,qtylist,qtyproduct,qtyrange,complexqty,num';
   init_regex_arr_list( \@SAFECMDLIST, 'num,si,numproduct,unit,complexnum' );
   if ( $enablecitmark || ( $ulem && !$disablecitmark ) ) {
     init_regex_arr_list( \@MBOXCMDLIST, $mboxcmds );