diff --git a/src/Compression/CompressedReadBufferBase.cpp b/src/Compression/CompressedReadBufferBase.cpp
index 8b16b68a999..5be31913140 100644
--- a/src/Compression/CompressedReadBufferBase.cpp
+++ b/src/Compression/CompressedReadBufferBase.cpp
@@ -67,20 +67,25 @@ static void validateChecksum(char * data, size_t size, const Checksum expected_c
         buf[pos / 8] ^= 1 << pos % 8;
     };
 
-    /// Check if the difference caused by single bit flip in data.
-    for (size_t bit_pos = 0; bit_pos < size * 8; ++bit_pos)
+    /// If size is too huge, then this may be caused by corruption.
+    /// And anyway this is pretty heavy, so avoid burning too much CPU here.
+    if (size < (1ULL << 20))
     {
-        flip_bit(data, bit_pos);
-
-        auto checksum_of_data_with_flipped_bit = CityHash_v1_0_2::CityHash128(data, size);
-        if (expected_checksum == checksum_of_data_with_flipped_bit)
+        /// Check if the difference caused by single bit flip in data.
+        for (size_t bit_pos = 0; bit_pos < size * 8; ++bit_pos)
         {
-            message << ". The mismatch is caused by single bit flip in data block at byte " << (bit_pos / 8) << ", bit " << (bit_pos % 8) << ". "
-                << message_hardware_failure;
-            throw Exception(message.str(), ErrorCodes::CHECKSUM_DOESNT_MATCH);
-        }
+            flip_bit(data, bit_pos);
 
-        flip_bit(data, bit_pos);    /// Restore
+            auto checksum_of_data_with_flipped_bit = CityHash_v1_0_2::CityHash128(data, size);
+            if (expected_checksum == checksum_of_data_with_flipped_bit)
+            {
+                message << ". The mismatch is caused by single bit flip in data block at byte " << (bit_pos / 8) << ", bit " << (bit_pos % 8) << ". "
+                    << message_hardware_failure;
+                throw Exception(message.str(), ErrorCodes::CHECKSUM_DOESNT_MATCH);
+            }
+
+            flip_bit(data, bit_pos);    /// Restore
+        }
     }
 
     /// Check if the difference caused by single bit flip in stored checksum.