diff --git a/src/cryptoki.hxx b/src/cryptoki.hxx
index 77838ee..38d97f6 100644
--- a/src/cryptoki.hxx
+++ b/src/cryptoki.hxx
@@ -573,6 +573,9 @@ namespace cryptoki {
       CK_VERSION hardwareVersion;
       CK_VERSION firmwareVersion;
 
+      SlotInfo() {
+      }
+
       //! Convert C-Structure of Slot Information Into C++
       SlotInfo(const CK_SLOT_INFO& cInfo):
           slotDescription(cInfo.slotDescription),
@@ -602,6 +605,9 @@ namespace cryptoki {
       CK_VERSION hardwareVersion;
       CK_VERSION firmwareVersion;
       FixString<16> utcTime;
+
+      TokenInfo() {
+      }
       
       //! Convert C-Structure of Token Information Into C++
       TokenInfo(const CK_TOKEN_INFO& cInfo):