diff --git a/libs/sofia-sip/configure.ac b/libs/sofia-sip/configure.ac
index 58cadbea90..46ae8e6621 100644
--- a/libs/sofia-sip/configure.ac
+++ b/libs/sofia-sip/configure.ac
@@ -34,6 +34,7 @@ AC_CONFIG_HEADERS([config.h])
 
 AC_GNU_SOURCE
 
+CFLAGS="$CFLAGS -DSU_DEBUG=0 $DEBUG_CFLAGS"
 ### checks for programs
 ### -------------------
 AC_LANG([C])
diff --git a/libs/sofia-sip/configure.gnu b/libs/sofia-sip/configure.gnu
index 7bd9c100c5..c0c20bab8f 100644
--- a/libs/sofia-sip/configure.gnu
+++ b/libs/sofia-sip/configure.gnu
@@ -1,3 +1,3 @@
 #! /bin/sh
-CFLAGS="$CFLAGS -DSU_DEBUG=0 $DEBUG_CFLAGS" ./configure "$@" --with-pic --with-glib=no --disable-shared
+./configure "$@" --with-pic --with-glib=no --disable-shared