diff --git a/lib/modules/SSL.pmod/https.pike b/lib/modules/SSL.pmod/https.pike
index 3adf1350f51ec376c05980c9a05a2adb7ba912c5..ba944889b25942af24ea4d2b4c855ffcd922634a 100644
--- a/lib/modules/SSL.pmod/https.pike
+++ b/lib/modules/SSL.pmod/https.pike
@@ -6,7 +6,9 @@
 
 //! Dummy HTTPS server/client
 
+#ifndef PORT
 #define PORT 25678
+#endif
 
 #ifdef SSL3_DEBUG
 #define SSL3_DEBUG_MSG(X ...)  werror(X)