1 files changed, 2 insertions, 1 deletions
diff --git a/file.c b/file.c
index 9f430a3382..96dd1b247e 100644
--- a/file.c
+++ b/file.c
@@ -5644,11 +5644,12 @@ ruby_is_fd_loadable(int fd)
 
     if (fstat(fd, &st) < 0)
 	return 0;
+
     if (S_ISREG(st.st_mode))
 	return 1;
 
     if (S_ISFIFO(st.st_mode))
-	return 1;
+	return -1;
 
     if (S_ISDIR(st.st_mode))
 	errno = EISDIR;