diff --git a/src/cryptoki.hxx b/src/cryptoki.hxx
index eebe401..5c5ef58 100644
--- a/src/cryptoki.hxx
+++ b/src/cryptoki.hxx
@@ -2027,7 +2027,7 @@ namespace cryptoki {
         if (!check(_session._slot.library()->C_GetAttributeValue
                    (_session._session, _object, &attr, 1),
                    CRYPTOKI_FN_LOG("C_GetAttributeValue"))
-            || !(long)attr.ulValueLen>0l)
+            || !((long)attr.ulValueLen>0l))
            //! Without exception handling, size and type must be checked too.
           return res;
         try {
diff --git a/src/pcsc.hxx b/src/pcsc.hxx
index 87d9b7a..1820369 100644
--- a/src/pcsc.hxx
+++ b/src/pcsc.hxx
@@ -210,8 +210,9 @@ namespace pcsc {
           //! State and attribute list of a reader.
           class Status {
             public:
-              Status(unsigned long s, const std::string& a): state(s), atr(a) {}
-              const unsigned long state;
+              Status(unsigned DWORD s, const std::string& a):
+                  state(s), atr(a) {}
+              const unsigned DWORD state;
               const std::string atr;
           };
       
@@ -318,7 +319,7 @@ namespace pcsc {
           /*!
               * @note Take care: Strings may contain embedded @c 0.
               */
-          std::string control(unsigned long controlCode,
+          std::string control(unsigned DWORD controlCode,
                               std::string in) {
             DWORD len(256); // arbitrary
             UCHAR dataBuffer[256];
@@ -398,7 +399,7 @@ namespace pcsc {
           //! Sets state and throws an exception if neccessary.
           /*! @throw access_error if it is instanciated for exceptions and
               an error occured in the last command. */
-          bool check(long state, const std::string context="") {
+          bool check(DWORD state, const std::string context="") {
             _state = state;
             return _connection->check(state, context);
           }
@@ -585,7 +586,7 @@ namespace pcsc {
       //! Throws an exception if neccessary.
       /*! @throw access_error if it is instanciated for exceptions and
               an error occured in the last command. */
-      bool check(long s, const std::string& context="") {
+      bool check(DWORD s, const std::string& context="") {
         _state = s;
         return check(context);
       }
@@ -980,11 +981,11 @@ namespace pcsc {
         return ss.str();
       }
       //! set state
-      void state(long s) {
+      void state(DWORD s) {
         _state = s;
       }
       //! @returns state
-      long state() {
+      DWORD state() {
         return _state;
       }
       //! @returns connection id
@@ -1000,7 +1001,7 @@ namespace pcsc {
       bool _exc;
       SCARDCONTEXT _id;
       Scope _s;
-      long _state;
+      DWORD _state;
 
   };