diff --git a/ssl/ssltest.c b/ssl/ssltest.c
index 0592e6c2a..7d6b53eed 100644
--- a/ssl/ssltest.c
+++ b/ssl/ssltest.c
@@ -111,7 +111,7 @@
 
 #define _XOPEN_SOURCE 600	/* Or gethostname won't be declared properly
 				   on Linux and GNU platforms. */
-#define _XOPEN_SOURCE_EXTENDED	/* Or gethostname won't be declared properly
+#define _XOPEN_SOURCE_EXTENDED	1 /* Or gethostname won't be declared properly
 				   on Compaq platforms (at least with DEC C).
 				*/