diff --git a/src/libvterm/Makefile b/src/libvterm/Makefile
index 2fca6ad..e56c10a 100644
--- a/src/libvterm/Makefile
+++ b/src/libvterm/Makefile
@@ -66,6 +66,9 @@
 src/encoding/%.inc: src/encoding/%.tbl
 	perl -CSD tbl2inc_c.pl $< >$@
 
+src/fullwidth.inc:
+	@perl find-wide-chars.pl >$@
+
 src/encoding.lo: $(INCFILES)
 
 bin/%: bin/%.c $(LIBRARY)
diff --git a/src/libvterm/README b/src/libvterm/README
index 208066b..3e1ff30 100644
--- a/src/libvterm/README
+++ b/src/libvterm/README
@@ -11,6 +11,9 @@
 - Convert from C99 to C90.
 - Other changes to support embedding in Vim.
 
+To find the diff of a libvterm patch edit this URL, changing "999" to the patch
+number:
+    https://bazaar.launchpad.net/~libvterm/libvterm/trunk/diff/999?context=3
 
 To merge in changes from Github, do this:
 - Commit any pending changes.
diff --git a/src/libvterm/find-wide-chars.pl b/src/libvterm/find-wide-chars.pl
new file mode 100644
index 0000000..fc4a234
--- /dev/null
+++ b/src/libvterm/find-wide-chars.pl
@@ -0,0 +1,34 @@
+#!/usr/bin/perl
+
+use strict;
+use warnings;
+
+use Unicode::UCD qw( charprop );
+
+STDOUT->autoflush(1);
+
+sub iswide
+{
+   my ( $cp ) = @_;
+
+   my $width = charprop( $cp, "East_Asian_Width" ) or return;
+   return $width eq "Wide" || $width eq "Fullwidth";
+}
+
+my ( $start, $end );
+foreach my $cp ( 0 .. 0x1FFFF ) {
+   iswide($cp) or next;
+
+   if( defined $end and $end == $cp-1 ) {
+      # extend the range
+      $end = $cp;
+      next;
+   }
+
+   # start a new range
+   printf "  { %#04x, %#04x },\n", $start, $end if defined $start;
+
+   $start = $end = $cp;
+}
+
+printf "  { %#04x, %#04x },\n", $start, $end if defined $start;
diff --git a/src/libvterm/src/fullwidth.inc b/src/libvterm/src/fullwidth.inc
new file mode 100644
index 0000000..7ff142f
--- /dev/null
+++ b/src/libvterm/src/fullwidth.inc
@@ -0,0 +1,104 @@
+  { 0x1100, 0x115f },
+  { 0x231a, 0x231b },
+  { 0x2329, 0x232a },
+  { 0x23e9, 0x23ec },
+  { 0x23f0, 0x23f0 },
+  { 0x23f3, 0x23f3 },
+  { 0x25fd, 0x25fe },
+  { 0x2614, 0x2615 },
+  { 0x2648, 0x2653 },
+  { 0x267f, 0x267f },
+  { 0x2693, 0x2693 },
+  { 0x26a1, 0x26a1 },
+  { 0x26aa, 0x26ab },
+  { 0x26bd, 0x26be },
+  { 0x26c4, 0x26c5 },
+  { 0x26ce, 0x26ce },
+  { 0x26d4, 0x26d4 },
+  { 0x26ea, 0x26ea },
+  { 0x26f2, 0x26f3 },
+  { 0x26f5, 0x26f5 },
+  { 0x26fa, 0x26fa },
+  { 0x26fd, 0x26fd },
+  { 0x2705, 0x2705 },
+  { 0x270a, 0x270b },
+  { 0x2728, 0x2728 },
+  { 0x274c, 0x274c },
+  { 0x274e, 0x274e },
+  { 0x2753, 0x2755 },
+  { 0x2757, 0x2757 },
+  { 0x2795, 0x2797 },
+  { 0x27b0, 0x27b0 },
+  { 0x27bf, 0x27bf },
+  { 0x2b1b, 0x2b1c },
+  { 0x2b50, 0x2b50 },
+  { 0x2b55, 0x2b55 },
+  { 0x2e80, 0x2e99 },
+  { 0x2e9b, 0x2ef3 },
+  { 0x2f00, 0x2fd5 },
+  { 0x2ff0, 0x2ffb },
+  { 0x3000, 0x303e },
+  { 0x3041, 0x3096 },
+  { 0x3099, 0x30ff },
+  { 0x3105, 0x312d },
+  { 0x3131, 0x318e },
+  { 0x3190, 0x31ba },
+  { 0x31c0, 0x31e3 },
+  { 0x31f0, 0x321e },
+  { 0x3220, 0x3247 },
+  { 0x3250, 0x32fe },
+  { 0x3300, 0x4dbf },
+  { 0x4e00, 0xa48c },
+  { 0xa490, 0xa4c6 },
+  { 0xa960, 0xa97c },
+  { 0xac00, 0xd7a3 },
+  { 0xf900, 0xfaff },
+  { 0xfe10, 0xfe19 },
+  { 0xfe30, 0xfe52 },
+  { 0xfe54, 0xfe66 },
+  { 0xfe68, 0xfe6b },
+  { 0xff01, 0xff60 },
+  { 0xffe0, 0xffe6 },
+  { 0x16fe0, 0x16fe0 },
+  { 0x17000, 0x187ec },
+  { 0x18800, 0x18af2 },
+  { 0x1b000, 0x1b001 },
+  { 0x1f004, 0x1f004 },
+  { 0x1f0cf, 0x1f0cf },
+  { 0x1f18e, 0x1f18e },
+  { 0x1f191, 0x1f19a },
+  { 0x1f200, 0x1f202 },
+  { 0x1f210, 0x1f23b },
+  { 0x1f240, 0x1f248 },
+  { 0x1f250, 0x1f251 },
+  { 0x1f300, 0x1f320 },
+  { 0x1f32d, 0x1f335 },
+  { 0x1f337, 0x1f37c },
+  { 0x1f37e, 0x1f393 },
+  { 0x1f3a0, 0x1f3ca },
+  { 0x1f3cf, 0x1f3d3 },
+  { 0x1f3e0, 0x1f3f0 },
+  { 0x1f3f4, 0x1f3f4 },
+  { 0x1f3f8, 0x1f43e },
+  { 0x1f440, 0x1f440 },
+  { 0x1f442, 0x1f4fc },
+  { 0x1f4ff, 0x1f53d },
+  { 0x1f54b, 0x1f54e },
+  { 0x1f550, 0x1f567 },
+  { 0x1f57a, 0x1f57a },
+  { 0x1f595, 0x1f596 },
+  { 0x1f5a4, 0x1f5a4 },
+  { 0x1f5fb, 0x1f64f },
+  { 0x1f680, 0x1f6c5 },
+  { 0x1f6cc, 0x1f6cc },
+  { 0x1f6d0, 0x1f6d2 },
+  { 0x1f6eb, 0x1f6ec },
+  { 0x1f6f4, 0x1f6f6 },
+  { 0x1f910, 0x1f91e },
+  { 0x1f920, 0x1f927 },
+  { 0x1f930, 0x1f930 },
+  { 0x1f933, 0x1f93e },
+  { 0x1f940, 0x1f94b },
+  { 0x1f950, 0x1f95e },
+  { 0x1f980, 0x1f991 },
+  { 0x1f9c0, 0x1f9c0 },
diff --git a/src/libvterm/src/unicode.c b/src/libvterm/src/unicode.c
index 424b3e2..1c0b2db 100644
--- a/src/libvterm/src/unicode.c
+++ b/src/libvterm/src/unicode.c
@@ -591,8 +591,15 @@
 // ################################
 // ### The rest added by Paul Evans
 
+static const struct interval fullwidth[] = {
+#include "fullwidth.inc"
+};
+
 INTERNAL int vterm_unicode_width(uint32_t codepoint)
 {
+  if(bisearch(codepoint, fullwidth, sizeof(fullwidth) / sizeof(fullwidth[0]) - 1))
+    return 2;
+
   return WCWIDTH_FUNCTION(codepoint);
 }
 
diff --git a/src/version.c b/src/version.c
index cc092c2..ccd5644 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    776,
+/**/
     775,
 /**/
     774,