diff --git a/src/pty.c b/src/pty.c
index 56238a6..f11a22d 100644
--- a/src/pty.c
+++ b/src/pty.c
@@ -357,7 +357,7 @@
 static char PtyProto[] = "/dev/ptym/ptyXY";
 static char TtyProto[] = "/dev/pty/ttyXY";
 # else
-#  ifdef(__HAIKU__)
+#  ifdef __HAIKU__
 static char PtyProto[] = "/dev/pt/XY";
 static char TtyProto[] = "/dev/tt/XY";
 #  else