diff --git a/nbdkit.spec b/nbdkit.spec
index 443d918..df44222 100644
--- a/nbdkit.spec
+++ b/nbdkit.spec
@@ -6,7 +6,7 @@
 
 Name:           nbdkit
 Version:        1.1.9
-Release:        3%{?dist}
+Release:        4%{?dist}
 Summary:        NBD server
 
 License:        BSD
@@ -202,6 +202,10 @@ find $RPM_BUILD_ROOT -name '*.la' -delete
 # Workaround for broken libvirt (RHBZ#1138604).
 mkdir -p $HOME/.cache/libvirt
 
+# Make sure we can see the debug messages (RHBZ#1230160).
+export LIBGUESTFS_DEBUG=1
+export LIBGUESTFS_TRACE=1
+
 # libguestfs 1.20 in Fedora 18 doesn't support NBD client protocol, so
 # the tests cannot be run.
 %if 0%{?fedora} >= 19
@@ -294,6 +298,9 @@ make check
 
 
 %changelog
+* Wed Jun 10 2015 Richard W.M. Jones <rjones@redhat.com> - 1.1.9-4
+- Enable debugging messages when running make check.
+
 * Sat Jun 06 2015 Jitka Plesnikova <jplesnik@redhat.com> - 1.1.9-3
 - Perl 5.22 rebuild