1 files changed, 1 insertions, 1 deletions

diff --git a/src/composite.c b/src/composite.c
index e59ba352511..e0ac92ee20e 100644
--- a/src/composite.c
+++ b/src/composite.c
@@ -343,7 +343,7 @@ get_composition_id (charpos, bytepos, nchars, prop, string)
         {
           int this_width;
           ch = XINT (key_contents[i]);
-          this_width = CHAR_WIDTH (ch);
+          this_width = (ch == '\t' ? 1 : CHAR_WIDTH (ch));
           if (cmp->width < this_width)
             cmp->width = this_width;
         }