diff --git a/src/messages.c b/src/messages.c
index 9c4672cd..408afa0b 100644
--- a/src/messages.c
+++ b/src/messages.c
@@ -41,7 +41,7 @@
 #include "libssh/keys.h"
 #include "libssh/dh.h"
 #include "libssh/messages.h"
-#if WITH_SERVER
+#ifdef WITH_SERVER
 #include "libssh/server.h"
 #endif