diff --git a/pyghmi/ipmi/oem/lenovo/handler.py b/pyghmi/ipmi/oem/lenovo/handler.py
index 79c0dd1c..4c73ba03 100755
--- a/pyghmi/ipmi/oem/lenovo/handler.py
+++ b/pyghmi/ipmi/oem/lenovo/handler.py
@@ -128,7 +128,7 @@ class OEMHandler(generic.OEMHandler):
         # will need to retain data to differentiate
         # variations.  For example System X versus Thinkserver
         self.oemid = oemid
-        self.ipmicmd = weakref.ref(ipmicmd)
+        self.ipmicmd = weakref.proxy(ipmicmd)
         self._has_megarac = None
         self.oem_inventory_info = None
 
diff --git a/pyghmi/ipmi/sdr.py b/pyghmi/ipmi/sdr.py
index a61bc8f4..e011d88b 100644
--- a/pyghmi/ipmi/sdr.py
+++ b/pyghmi/ipmi/sdr.py
@@ -252,7 +252,7 @@ class SDREntry(object):
         # ignore record id for now, we only care about the sensor number for
         # moment
         self.reportunsupported = reportunsupported
-        self.ipmicmd = weakref.ref(ipmicmd)
+        self.ipmicmd = ipmicmd
         if entrybytes[2] != 0x51:
             # only recognize '1.5', the only version defined at time of writing
             raise NotImplementedError
@@ -585,7 +585,7 @@ class SDR(object):
     :param ipmicmd: A Command class object
     """
     def __init__(self, ipmicmd):
-        self.ipmicmd = weakref.ref(ipmicmd)
+        self.ipmicmd = weakref.proxy(ipmicmd)
         self.sensors = {}
         self.fru = {}
         self.read_info()