diff --git a/jc/parsers/asciitable_m.py b/jc/parsers/asciitable_m.py
index e6907d4c..2ae31c89 100644
--- a/jc/parsers/asciitable_m.py
+++ b/jc/parsers/asciitable_m.py
@@ -95,7 +95,7 @@ def _rstrip(string: str) -> str:
     rstrip_list = [x for x in string.splitlines() if not len(x.strip()) == 0]
     end_points = (len(x.rstrip()) for x in rstrip_list)
     max_point = max(end_points)
-    new_rstrip_list = (x[:max_point] for x in rstrip_list)
+    new_rstrip_list = ((x + ' ' * max_point)[:max_point] for x in rstrip_list)
     return '\n'.join(new_rstrip_list)
 
 
@@ -341,6 +341,7 @@ def parse(
     if jc.utils.has_data(data):
         data = _remove_ansi(data)
         data = _strip(data)
+        print(data.replace(' ', '~'))
         table_type = _table_sniff(data)
 
         if table_type == 'pretty':
diff --git a/tests/test_asciitable_m.py b/tests/test_asciitable_m.py
index d0b29f7d..ea398b4e 100644
--- a/tests/test_asciitable_m.py
+++ b/tests/test_asciitable_m.py
@@ -1,5 +1,6 @@
 import os
 import unittest
+from jc.exceptions import ParseError
 import jc.parsers.asciitable_m
 
 THIS_DIR = os.path.dirname(os.path.abspath(__file__))
@@ -217,6 +218,32 @@ class MyTests(unittest.TestCase):
 
         self.assertEqual(jc.parsers.asciitable_m.parse(input, quiet=True), expected)
 
+    def test_asciitable_m_markdown(self):
+        """
+        Test 'asciitable_m' with a markdown table. Should raise a ParseError
+        """
+        input = '''
+        | type   |   total |   used |    free |   shared |   buff cache |   available |
+        |--------|---------|--------|---------|----------|--------------|-------------|
+        | Mem    | 3861332 | 222820 | 3364176 |    11832 |       274336 |     3389588 |
+        | Swap   | 2097148 |      0 | 2097148 |          |              |             |
+        '''
+
+        self.assertRaises(ParseError, jc.parsers.asciitable_m.parse, input, quiet=True)
+
+    def test_asciitable_m_simple(self):
+        """
+        Test 'asciitable_m' with a simple table. Should raise a ParseError
+        """
+        input = '''
+        type      total    used     free    shared    buff cache    available
+        ------  -------  ------  -------  --------  ------------  -----------
+        Mem     3861332  222820  3364176     11832        274336      3389588
+        Swap    2097148       0  2097148
+        '''
+
+        self.assertRaises(ParseError, jc.parsers.asciitable_m.parse, input, quiet=True)
+
 
 if __name__ == '__main__':
     unittest.main()