diff --git a/tools/memap.py b/tools/memap.py
index 132e12e061..16ed2645ba 100644
--- a/tools/memap.py
+++ b/tools/memap.py
@@ -280,7 +280,10 @@ class _ArmccParser(_Parser):
         """  # noqa: E501
         test_re = re.match(self.RE, line)
 
-        if test_re:
+        if (
+            test_re
+            and "ARM_LIB_HEAP" not in line
+            ):
             size = int(test_re.group(2), 16)
 
             if test_re.group(4) == 'RO':