diff --git a/passes/techmap/abc.cc b/passes/techmap/abc.cc
index 422879662..b33e1a17d 100644
--- a/passes/techmap/abc.cc
+++ b/passes/techmap/abc.cc
@@ -804,8 +804,10 @@ void abc_module(RTLIL::Design *design, RTLIL::Module *current_module, std::strin
 		for (std::string dont_use_cell : dont_use_cells) {
 			dont_use_args += stringf("-X \"%s\" ", dont_use_cell.c_str());
 		}
+		bool first_lib = true;
 		for (std::string liberty_file : liberty_files) {
-			abc_script += stringf("read_lib %s -w \"%s\" ; ", dont_use_args.c_str(), liberty_file.c_str());
+			abc_script += stringf("read_lib %s %s -w \"%s\" ; ", dont_use_args.c_str(), first_lib ? "" : "-m", liberty_file.c_str());
+			first_lib = false;
 		}
 		for (std::string liberty_file : genlib_files)
 			abc_script += stringf("read_library \"%s\"; ", liberty_file.c_str());