diff --git a/test/lib/completions/dd.exp b/test/lib/completions/dd.exp
index 81755799..400dd143 100644
--- a/test/lib/completions/dd.exp
+++ b/test/lib/completions/dd.exp
@@ -17,4 +17,17 @@ assert_complete_any "dd --"
 sync_after_int
 
 
+set test "option should be suffixed with ="
+set cmd "dd if"
+send "$cmd\t"
+expect -ex "$cmd"
+expect {
+    -re "^=$" { pass $test }
+    -re {^\\=$} { xfail $test }
+}; # expect
+
+
+sync_after_int
+
+
 teardown