1 files changed, 1 insertions, 1 deletions

diff --git a/src/fileio.c b/src/fileio.c
index 99c9b0f30e4..d8164d64dc8 100644
--- a/src/fileio.c
+++ b/src/fileio.c
@@ -3150,7 +3150,7 @@ This does code conversion according to the value of\n\
     else
       {
         if (SYMBOLP (Vauto_file_coding_system_function)
-            && Fboundp (Vauto_file_coding_system_function))
+            && !NILP (Fboundp (Vauto_file_coding_system_function)))
           {
             /* Find a coding system specified in a few lines at the
                head of the file.  We assume that the fist 1K bytes is