diff --git a/etc/memory_reports_over_time.py b/etc/memory_reports_over_time.py
index 44a969d2d57..af3a052165a 100644
--- a/etc/memory_reports_over_time.py
+++ b/etc/memory_reports_over_time.py
@@ -28,7 +28,8 @@ def extract_memory_reports(lines):
         elif line == 'End memory reports\n':
             in_report = False
         elif in_report:
-            report_lines[-1].append(line.strip())
+            if line.startswith('|'):
+                report_lines[-1].append(line.strip())
     return (report_lines, times)
 
 
@@ -72,6 +73,17 @@ def transform_report_for_test(report):
     return transformed
 
 
+def test_extract_memory_reports():
+    input = ["Begin memory reports",
+             "|",
+             "  154.56 MiB -- explicit\n",
+             "|     107.88 MiB -- system-heap-unclassified\n",
+             "End memory reports\n"]
+    expected = ([['|', '|     107.88 MiB -- system-heap-unclassified']], ['reports'])
+    assert(extract_memory_reports(input) == expected)
+    return 0
+
+
 def test():
     input = '''|
 |   23.89 MiB -- explicit
@@ -105,6 +117,7 @@ def test():
     assert(sorted(transformed.keys()) == sorted(expected.keys()))
     for k, v in transformed.items():
         assert(v == expected[k])
+    test_extract_memory_reports()
     return 0