diff --git a/src/lib.c b/src/lib.c
index 272eed6..f5ecc2c 100755
--- a/src/lib.c
+++ b/src/lib.c
@@ -504,7 +504,7 @@ lzsa_status_t lzsa_decompress_stream(lzsa_stream_t *pInStream, lzsa_stream_t *pO
                nReadBytes -= 4;
             else
                nReadBytes = 0;
-            nBlockSize = nReadBytes;
+            nBlockSize = (unsigned int)nReadBytes;
          }
 
          if (nReadBytes == nBlockSize) {