diff --git a/kernel/yosys.cc b/kernel/yosys.cc
index ef81d042c..b5f91d6dd 100644
--- a/kernel/yosys.cc
+++ b/kernel/yosys.cc
@@ -1173,6 +1173,7 @@ void run_pass(std::string command, RTLIL::Design *design)
 	log("\n-- Running command `%s' --\n", command.c_str());
 
 	Pass::call(design, command);
+	log_flush();
 }
 
 void run_backend(std::string filename, std::string command, RTLIL::Design *design)