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-rw-r--r--passes/tests/test_cell.cc2
1 files changed, 1 insertions, 1 deletions
diff --git a/passes/tests/test_cell.cc b/passes/tests/test_cell.cc
index edab51eb..c69bd123 100644
--- a/passes/tests/test_cell.cc
+++ b/passes/tests/test_cell.cc
@@ -262,7 +262,7 @@ static void run_eval_test(RTLIL::Design *design, bool verbose, std::string uut_n
gold_ce.set(gold_wire, in_value);
gate_ce.set(gate_wire, in_value);
- if (vlog_file.is_open()) {
+ if (vlog_file.is_open() && SIZE(in_value) > 0) {
vlog_file << stringf(" %s = 'b%s;\n", log_id(gold_wire), in_value.as_string().c_str());
if (!vlog_pattern_info.empty())
vlog_pattern_info += " ";