diff --git a/panda/src/express/encryptStream.cxx b/panda/src/express/encryptStream.cxx
index 74df072324..87ede4d3e4 100644
--- a/panda/src/express/encryptStream.cxx
+++ b/panda/src/express/encryptStream.cxx
@@ -18,6 +18,7 @@
 
 #include "encryptStream.h"
 
+#ifdef HAVE_SSL
 ////////////////////////////////////////////////////////////////////
 //     Function: encrypt_string
 //       Access: Published
@@ -64,3 +65,5 @@ decrypt_string(const string &source, const string &password) {
 
   return output.str();
 }
+
+#endif // HAVE_SSL