diff --git a/include/rabit/engine.h b/include/rabit/engine.h
index a2f5da25b..272bbb8ef 100644
--- a/include/rabit/engine.h
+++ b/include/rabit/engine.h
@@ -183,7 +183,9 @@ enum DataType {
   kLong = 4,
   kULong = 5,
   kFloat = 6,
-  kDouble = 7
+  kDouble = 7,
+  kLongLong = 8,
+  kULongLong = 9
 };
 }  // namespace mpi
 /*!
diff --git a/include/rabit/rabit-inl.h b/include/rabit/rabit-inl.h
index 3d1ec59a8..219bff174 100644
--- a/include/rabit/rabit-inl.h
+++ b/include/rabit/rabit-inl.h
@@ -30,7 +30,7 @@ inline DataType GetType<int>(void) {
   return kInt;
 }
 template<>
-inline DataType GetType<unsigned>(void) {
+inline DataType GetType<unsigned int>(void) {
   return kUInt;
 }
 template<>
@@ -49,6 +49,14 @@ template<>
 inline DataType GetType<double>(void) {
   return kDouble;
 }
+template<>
+inline DataType GetType<long long>(void) {
+	return kLongLong;
+}
+template<>
+inline DataType GetType<unsigned long long>(void) {
+	return kULongLong;
+}
 }  // namespace mpi
 }  // namespace engine
 
diff --git a/src/engine_mpi.cc b/src/engine_mpi.cc
index 5c8a4c372..0b04877b8 100644
--- a/src/engine_mpi.cc
+++ b/src/engine_mpi.cc
@@ -110,6 +110,8 @@ inline MPI::Datatype GetType(mpi::DataType dtype) {
     case kULong: return MPI::UNSIGNED_LONG;
     case kFloat: return MPI::FLOAT;
     case kDouble: return MPI::DOUBLE;
+    case kLongLong: return MPI::LONG_LONG;
+    case kULongLong: return MPI::UNSIGNED_LONG_LONG;
   }
   utils::Error("unknown mpi::DataType");
   return MPI::CHAR;