diff --git a/src/ctx.cpp b/src/ctx.cpp
index 727d9428..e99c0eb8 100644
--- a/src/ctx.cpp
+++ b/src/ctx.cpp
@@ -99,7 +99,7 @@ zmq::ctx_t::ctx_t () :
     // allow opening of /dev/urandom
     unsigned char tmpbytes[4];
     randombytes(tmpbytes, 4);
-#else
+#elif defined (HAVE_LIBSODIUM)
     int rc = sodium_init ();
     zmq_assert (rc != -1);
 #endif