diff --git a/source/tools/detect/mem/memgraph/memgraph.py b/source/tools/detect/mem/memgraph/memgraph.py
index 2a85966944823f59d368ca5566110f58f576c0c2..520dab07030b6d624a83744b6c4211e13f0046c8 100644
--- a/source/tools/detect/mem/memgraph/memgraph.py
+++ b/source/tools/detect/mem/memgraph/memgraph.py
@@ -396,6 +396,7 @@ def read_cgroup_stat(filename):
         return stat
     fd = open(filename)
     ret = fd.read().strip().split("\n")
+    fd.close()
     for line in ret:
         line = line.strip().split()
         if len(line) < 2: