diff --git a/libs/sofia-sip/configure.gnu b/libs/sofia-sip/configure.gnu
index c0c20bab8f..12fe773bd0 100644
--- a/libs/sofia-sip/configure.gnu
+++ b/libs/sofia-sip/configure.gnu
@@ -1,3 +1,3 @@
 #! /bin/sh
-./configure "$@" --with-pic --with-glib=no --disable-shared
+CFLAGS="$CFLAGS -DSU_DEBUG=0" ./configure "$@" --with-pic --with-glib=no --disable-shared