diff --git a/passes/techmap/dfflibmap.cc b/passes/techmap/dfflibmap.cc
index f3b96aeec..f2bd16082 100644
--- a/passes/techmap/dfflibmap.cc
+++ b/passes/techmap/dfflibmap.cc
@@ -609,9 +609,7 @@ struct DfflibmapPass : public Pass {
 		{
 			std::string arg = args[argidx];
 			if (arg == "-liberty" && argidx+1 < args.size()) {
-				std::string liberty_file = args[++argidx];
-				rewrite_filename(liberty_file);
-				liberty_files.push_back(liberty_file);
+				append_globbed(liberty_files, args[++argidx]);
 				continue;
 			}
 			if (arg == "-prepare") {
diff --git a/tests/techmap/dfflibmap.ys b/tests/techmap/dfflibmap.ys
index 822d87a36..303daee48 100644
--- a/tests/techmap/dfflibmap.ys
+++ b/tests/techmap/dfflibmap.ys
@@ -23,7 +23,7 @@ read_liberty -lib dfflibmap.lib
 equiv_opt -map dfflibmap-sim.v -assert -multiclock dfflibmap -liberty dfflibmap.lib
 equiv_opt -map dfflibmap-sim.v -assert -multiclock dfflibmap -prepare -liberty dfflibmap.lib
 
-dfflibmap -prepare -liberty dfflibmap.lib
+dfflibmap -prepare -liberty dffl*bmap.lib
 equiv_opt -map dfflibmap-sim.v -assert -multiclock dfflibmap -map-only -liberty dfflibmap.lib
 
 design -load orig