diff --git a/dbms/src/IO/Compression/CompressionCodecDeltaFor.cpp b/dbms/src/IO/Compression/CompressionCodecDeltaFor.cpp
index fbbbf4f9eec..29c4b6f323a 100644
--- a/dbms/src/IO/Compression/CompressionCodecDeltaFor.cpp
+++ b/dbms/src/IO/Compression/CompressionCodecDeltaFor.cpp
@@ -55,6 +55,7 @@ namespace
 template <typename T>
 UInt32 compressData(const char * source, UInt32 source_size, char * dest)
 {
+    static_assert(std::is_integral<T>::value, "Integral required.");
     const auto count = source_size / sizeof(T);
     using ST = typename std::make_signed<T>::type;
     std::vector<ST> deltas;