diff --git a/ksim/monitors/snmp/pdu.cpp b/ksim/monitors/snmp/pdu.cpp
index e06539a..9ad1110 100644
--- a/ksim/monitors/snmp/pdu.cpp
+++ b/ksim/monitors/snmp/pdu.cpp
@@ -48,7 +48,7 @@ PDU::~PDU()
 void PDU::addNullVariables( const IdentifierList &oids )
 {
     std::for_each( oids.begin(), oids.end(),
-                   std::bind1st( std::mem_fun( &PDU::addNullVariable ), this ) );
+                   std::bind( std::mem_fn( &PDU::addNullVariable ), this, std::placeholders::_1 ) );
 }
 
 void PDU::addNullVariable( Identifier oid )
diff --git a/ksim/monitors/snmp/walker.cpp b/ksim/monitors/snmp/walker.cpp
index 81a36f4..c74097b 100644
--- a/ksim/monitors/snmp/walker.cpp
+++ b/ksim/monitors/snmp/walker.cpp
@@ -29,7 +29,7 @@ using namespace KSim::Snmp;
 namespace
 {
     template <class T>
-    struct Deleter : public std::unary_function<T, void>
+    struct Deleter : public std::function<void(T)>
     {
         void operator()( T arg )
         { delete arg; }