diff --git a/passes/techmap/libparse.cc b/passes/techmap/libparse.cc
index 8f4a1a5f..8cbb8e2b 100644
--- a/passes/techmap/libparse.cc
+++ b/passes/techmap/libparse.cc
@@ -126,6 +126,11 @@ int LibertyParser::lexer(std::string &str)
 					line++;
 			}
 			return lexer(str);
+		} else if (c == '/') {
+			while (c > 0 && c != '\n')
+				c = fgetc(f);
+			line++;
+			return lexer(str);
 		}
 		ungetc(c, f);
 		// fprintf(stderr, "LEX: char >>/<<\n");