diff --git a/src/openssl.c b/src/openssl.c
index 4905cc84..0ac4a279 100644
--- a/src/openssl.c
+++ b/src/openssl.c
@@ -415,10 +415,12 @@ ssl_init (void)
   return false;
 }
 
+#if defined DEBUG_MALLOC || defined TESTING
 void
 ssl_cleanup (void)
 {
 }
+#endif
 
 struct openssl_transport_context
 {