diff --git a/virt-v2v.spec b/virt-v2v.spec
index 246f084..08dfd85 100644
--- a/virt-v2v.spec
+++ b/virt-v2v.spec
@@ -268,10 +268,12 @@ export LIBGUESTFS_TRACE=1
 # The built in tests take a very long time to run under TCG (in Koji),
 # so just perform a very simple conversion to check things are
 # working.
-make -C test-data/phony-guests windows.img
-./run virt-v2v -v -x -i disk test-data/phony-guests/windows.img -o null
-make -C test-data/phony-guests fedora.img
-./run virt-v2v -v -x -i disk test-data/phony-guests/fedora.img -o null
+for f in windows.img fedora.img; do
+    make -C test-data/phony-guests $f
+    if -s test-data/phony-guests/$f; then
+        ./run virt-v2v -v -x -i disk test-data/phony-guests/$f -o null
+    fi
+done
 %endif