diff --git a/machado/loaders/common.py b/machado/loaders/common.py
index 08296f2..659d877 100644
--- a/machado/loaders/common.py
+++ b/machado/loaders/common.py
@@ -86,9 +86,9 @@ def get_num_lines(file_path):
 
     i = 0
     for line in fp:
-        if type(line) == str and str(line).startswith("#"):
+        if type(line) is str and str(line).startswith("#"):
             continue
-        if type(line) == bytes and line.startswith(b"#"):
+        if type(line) is bytes and line.startswith(b"#"):
             continue
         i += 1
     return i