diff --git a/webbuild/webbuild-sudo b/webbuild/webbuild-sudo
index 34530e2..ac05c6a 100755
--- a/webbuild/webbuild-sudo
+++ b/webbuild/webbuild-sudo
@@ -88,10 +88,11 @@ if [ "$MODE" = "specinfo" ]; then
       done < ${ENVPREFIX}${WORKINGHOME}/RPM/SPECS/$PACKAGE.spec
       [ "$AUTOBUILDREQ_BEGIN" -a "$AUTOBUILDREQ_END" -a ! "$AUTOBUILDREQ_UNDONE" ] || \
          echo "SPECVAR_CHECK_NOAUTOBUILDREQ=1"
-      $SUCMDPREFIX "rpmspec -P ${WORKINGHOME}/RPM/SPECS/$PACKAGE.spec > ${WORKINGHOME}/RPM/SPECS/$PACKAGE.spec.tmp 2>/dev/null"
+      # _setup: prevent %setup macro expansion
+      $SUCMDPREFIX "rpmspec -P ${WORKINGHOME}/RPM/SPECS/$PACKAGE.spec --define \"%setup _setup\" > ${WORKINGHOME}/RPM/SPECS/$PACKAGE.spec.tmp 2>/dev/null"
       if [ -e  $SPECFILE.tmp ]; then
          echo "SPECVAR_Specfile=\"$SPECFILE\""
-         BUILDDIR=`grep -m1 "^%setup.*-n " $SPECFILE.tmp | sed "s|.*-n \([^[:space:]]*\).*|\1|"`
+         BUILDDIR=`grep -m1 "^_setup.*-n " $SPECFILE.tmp | sed "s|.*-n \([^[:space:]]*\).*|\1|"`
          while read line; do
             set -- $line
             [ "$1" = "%package" -o "$1" = "%description" ] && break