diff --git a/bitchat/Utils/CompressionUtil.swift b/bitchat/Utils/CompressionUtil.swift
index 4fabf38a..f9b1491b 100644
--- a/bitchat/Utils/CompressionUtil.swift
+++ b/bitchat/Utils/CompressionUtil.swift
@@ -27,7 +27,7 @@ struct CompressionUtil {
             return compression_encode_buffer(
                 destinationBuffer, data.count,
                 sourcePtr, data.count,
-                nil, COMPRESSION_LZ4
+                nil, COMPRESSION_ZLIB
             )
         }
         
@@ -46,7 +46,7 @@ struct CompressionUtil {
             return compression_decode_buffer(
                 destinationBuffer, originalSize,
                 sourcePtr, compressedData.count,
-                nil, COMPRESSION_LZ4
+                nil, COMPRESSION_ZLIB
             )
         }
         
@@ -72,4 +72,4 @@ struct CompressionUtil {
         let uniqueByteRatio = Double(byteFrequency.count) / Double(min(data.count, 256))
         return uniqueByteRatio < 0.9 // Compress if less than 90% unique bytes
     }
-}
\ No newline at end of file
+}