diff --git a/dbms/src/Columns/ColumnDecimal.h b/dbms/src/Columns/ColumnDecimal.h
index 308d237c3a9..2bdaaf8d536 100644
--- a/dbms/src/Columns/ColumnDecimal.h
+++ b/dbms/src/Columns/ColumnDecimal.h
@@ -166,7 +166,7 @@ template <typename T>
 template <typename Type>
 ColumnPtr ColumnDecimal<T>::indexImpl(const PaddedPODArray<Type> & indexes, UInt64 limit) const
 {
-    UInt64 size = indexes.size();
+    size_t size = indexes.size();
 
     if (limit == 0)
         limit = size;
diff --git a/dbms/src/Columns/ColumnVector.h b/dbms/src/Columns/ColumnVector.h
index da3e62aac03..7159c25aa59 100644
--- a/dbms/src/Columns/ColumnVector.h
+++ b/dbms/src/Columns/ColumnVector.h
@@ -275,7 +275,7 @@ template <typename T>
 template <typename Type>
 ColumnPtr ColumnVector<T>::indexImpl(const PaddedPODArray<Type> & indexes, UInt64 limit) const
 {
-    UInt64 size = indexes.size();
+    size_t size = indexes.size();
 
     if (limit == 0)
         limit = size;
diff --git a/dbms/src/Columns/IColumnUnique.h b/dbms/src/Columns/IColumnUnique.h
index fbb2e5625f7..f3567fb8760 100644
--- a/dbms/src/Columns/IColumnUnique.h
+++ b/dbms/src/Columns/IColumnUnique.h
@@ -99,7 +99,7 @@ public:
         throw Exception("Method deserializeAndInsertFromArena is not supported for ColumnUnique.", ErrorCodes::NOT_IMPLEMENTED);
     }
 
-    ColumnPtr index(const IColumn &, UInt64) const override
+    ColumnPtr index(const IColumn &, size_t) const override
     {
         throw Exception("Method index is not supported for ColumnUnique.", ErrorCodes::NOT_IMPLEMENTED);
     }
@@ -114,7 +114,7 @@ public:
         throw Exception("Method filter is not supported for ColumnUnique.", ErrorCodes::NOT_IMPLEMENTED);
     }
 
-    ColumnPtr permute(const IColumn::Permutation &, UInt64) const override
+    ColumnPtr permute(const IColumn::Permutation &, size_t) const override
     {
         throw Exception("Method permute is not supported for ColumnUnique.", ErrorCodes::NOT_IMPLEMENTED);
     }
@@ -124,7 +124,7 @@ public:
         throw Exception("Method replicate is not supported for ColumnUnique.", ErrorCodes::NOT_IMPLEMENTED);
     }
 
-    void getPermutation(bool, UInt64, int, IColumn::Permutation &) const override
+    void getPermutation(bool, size_t, int, IColumn::Permutation &) const override
     {
         throw Exception("Method getPermutation is not supported for ColumnUnique.", ErrorCodes::NOT_IMPLEMENTED);
     }
diff --git a/dbms/src/Storages/IStorage.h b/dbms/src/Storages/IStorage.h
index 53adf573c52..7397d285b80 100644
--- a/dbms/src/Storages/IStorage.h
+++ b/dbms/src/Storages/IStorage.h
@@ -185,7 +185,7 @@ public:
         const SelectQueryInfo & /*query_info*/,
         const Context & /*context*/,
         QueryProcessingStage::Enum /*processed_stage*/,
-        UInt64 /*max_block_size*/,
+        size_t /*max_block_size*/,
         unsigned /*num_streams*/)
     {
         throw Exception("Method read is not supported by storage " + getName(), ErrorCodes::NOT_IMPLEMENTED);