diff --git a/tests/mv/diag b/tests/mv/diag
index 125e8658c..a3fb530da 100755
--- a/tests/mv/diag
+++ b/tests/mv/diag
@@ -1,6 +1,8 @@
 #!/bin/sh
 # make sure we get proper diagnostics: e.g., with --target-dir=d but no args
 
+. $srcdir/../expensive
+
 if test "$VERBOSE" = yes; then
   set -x
   mv --version