diff --git a/configure.ac b/configure.ac
index 6c7cae8a..dafcf606 100644
--- a/configure.ac
+++ b/configure.ac
@@ -275,8 +275,6 @@ AS_IF([test "$GNUTLS_LIBS" != ""],[
         [tls_priority=$withval],
         [tls_priority=NORMAL])
     AC_MSG_RESULT([$tls_priority])
-    AC_DEFINE_UNQUOTED([TLS_PRIORITY],["$tls_priority"],
-                       [Default TLS session priority string])
 
     # Check for working <gnutls/socket.h>.  This is only needed for
     # gnutls 3.7.9 and no other version (unfortunately used by Debian
@@ -299,6 +297,11 @@ AS_IF([test "$GNUTLS_LIBS" != ""],[
     LIBS="$old_LIBS"
 ])
 
+dnl Define unconditionally because TLS_PRIORITY must be defined to
+dnl compile, even if GNUTLS support isn't enabled
+AC_DEFINE_UNQUOTED([TLS_PRIORITY],["$tls_priority"],
+                   [Default TLS session priority string])
+
 dnl certtool (part of GnuTLS) for testing TLS with certificates.
 dnl macOS has its own program called certtool and packages the
 dnl GnuTLS tool as "gnutls-certtool".