diff --git a/ethcore/src/snapshot/mod.rs b/ethcore/src/snapshot/mod.rs
index 8e5ca72b2..a1caa8e14 100644
--- a/ethcore/src/snapshot/mod.rs
+++ b/ethcore/src/snapshot/mod.rs
@@ -78,6 +78,8 @@ fn write_chunk(raw_data: &[u8], compression_buffer: &mut Vec<u8>, path: &Path) -
 	let compressed = &compression_buffer[..compressed_size];
 	let hash = compressed.sha3();
 
+	assert!(snappy::validate_compressed_buffer(compressed));
+
 	let mut file_path = path.to_owned();
 	file_path.push(hash.hex());