diff --git a/frontends/liberty/liberty.cc b/frontends/liberty/liberty.cc
index 66db43baf..4acfbf1cb 100644
--- a/frontends/liberty/liberty.cc
+++ b/frontends/liberty/liberty.cc
@@ -36,7 +36,8 @@ static RTLIL::SigSpec parse_func_identifier(RTLIL::Module *module, const char *&
 
 	int id_len = 0;
 	while (('a' <= expr[id_len] && expr[id_len] <= 'z') || ('A' <= expr[id_len] && expr[id_len] <= 'Z') ||
-			('0' <= expr[id_len] && expr[id_len] <= '9') || expr[id_len] == '.' || expr[id_len] == '_') id_len++;
+			('0' <= expr[id_len] && expr[id_len] <= '9') || expr[id_len] == '.' ||
+			expr[id_len] == '_' || expr[id_len] == '[' || expr[id_len] == ']') id_len++;
 
 	if (id_len == 0)
 		log_error("Expected identifier at `%s'.\n", expr);
diff --git a/passes/techmap/libparse.cc b/passes/techmap/libparse.cc
index bb09117e2..3927a657b 100644
--- a/passes/techmap/libparse.cc
+++ b/passes/techmap/libparse.cc
@@ -90,11 +90,11 @@ int LibertyParser::lexer(std::string &str)
 		c = f.get();
 	} while (c == ' ' || c == '\t' || c == '\r');
 
-	if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_' || c == '-' || c == '+' || c == '.') {
+	if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_' || c == '-' || c == '+' || c == '.' || c == '[' || c == ']') {
 		str = c;
 		while (1) {
 			c = f.get();
-			if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_' || c == '-' || c == '+' || c == '.')
+			if (('a' <= c && c <= 'z') || ('A' <= c && c <= 'Z') || ('0' <= c && c <= '9') || c == '_' || c == '-' || c == '+' || c == '.' || c == '[' || c == ']')
 				str += c;
 			else
 				break;