diff --git a/lib/if2ip.h b/lib/if2ip.h
index 239087d74..f2c3a541f 100644
--- a/lib/if2ip.h
+++ b/lib/if2ip.h
@@ -25,7 +25,7 @@
 #include "setup.h"
 
 #if !defined(WIN32) && !defined(__BEOS__) && !defined(__CYGWIN32__) && \
-    !defined(__riscos__) !defined(__INTERIX)
+    !defined(__riscos__) && !defined(__INTERIX)
 extern char *Curl_if2ip(char *interface, char *buf, int buf_size);
 #else
 #define Curl_if2ip(a,b,c) NULL