diff --git a/passes/cmds/show.cc b/passes/cmds/show.cc
index d57cbc6bb..8c2695dbe 100644
--- a/passes/cmds/show.cc
+++ b/passes/cmds/show.cc
@@ -539,7 +539,7 @@ struct ShowWorker
 			std::string proc_src = RTLIL::unescape_id(proc->name);
 			if (proc->attributes.count(ID::src) > 0)
 				proc_src = proc->attributes.at(ID::src).decode_string();
-			fprintf(f, "p%d [shape=box, style=rounded, label=\"PROC %s\\n%s\"];\n", pidx, findLabel(proc->name.str()), proc_src.c_str());
+			fprintf(f, "p%d [shape=box, style=rounded, label=\"PROC %s\\n%s\", %s];\n", pidx, findLabel(proc->name.str()), proc_src.c_str(), findColor(proc->name).c_str());
 		}
 
 		for (auto &conn : module->connections())