1 files changed, 1 insertions, 1 deletions

diff --git a/src/fontset.c b/src/fontset.c
index 976e27165c3..fe3526852c0 100644
--- a/src/fontset.c
+++ b/src/fontset.c
@@ -435,7 +435,7 @@ fontset_pattern_regexp (pattern)
               *p1++ = '*';
             }
           else if (*p0 == '?')
-            *p1++ == '.';
+            *p1++ = '.';
           else
             *p1++ = *p0;
         }