diff --git a/genpp.pl b/genpp.pl
index 53c496f..63e45dc 100644
--- a/genpp.pl
+++ b/genpp.pl
@@ -16,6 +16,7 @@
   uchar => ['byte', 'unsigned char'],
   c_string => ['char *', 'char *'],
   size_t => ['indx', 'size_t'],
+  uint64 => ['ulonglong', 'uint64_t'],
   int => [$INT_PDLTYPE, 'int'],
 );
 our %type_alias = (
diff --git a/typemap b/typemap
index 9fcd069..a888035 100644
--- a/typemap
+++ b/typemap
@@ -12,6 +12,8 @@ DMatchWrapper* T_PTROBJ_SPECIAL
 FileStorageWrapper* T_PTROBJ_SPECIAL
 FileNodeWrapper* T_PTROBJ_SPECIAL
 
+uint64_t T_IV
+
 INPUT
 T_PTROBJ_SPECIAL
   if (!SvOK($arg)) {