diff --git a/lang/cpp/src/interfaces/dataprovider.h b/lang/cpp/src/interfaces/dataprovider.h
index c8f387d6..ad69e705 100644
--- a/lang/cpp/src/interfaces/dataprovider.h
+++ b/lang/cpp/src/interfaces/dataprovider.h
@@ -26,6 +26,7 @@
 #define __GPGMEPP_INTERFACES_DATAPROVIDER_H__
 
 #include <sys/types.h>
+#include <cstdint>
 
 #include "gpgmepp_export.h"
 
@@ -40,7 +41,7 @@ public:
     virtual ~DataProvider() {}
 
     enum Operation {
-        Read, Write, Seek, Release
+        Read, Write, Seek, Release, Seek64
     };
     virtual bool isSupported(Operation op) const = 0;
 
@@ -48,6 +49,9 @@ public:
     virtual ssize_t write(const void *buffer, size_t bufSize) = 0;
     virtual off_t seek(off_t offset, int whence) = 0;
     virtual void release() = 0;
+    virtual uint64_t seek64(uint64_t offset, int whence) {
+        return seek((off_t)offset, whence);
+    }
 };
 
 } // namespace GpgME