diff --git a/src/liblzma/common/stream_encoder_mt.c b/src/liblzma/common/stream_encoder_mt.c
index 6dc10c3a..573a13b5 100644
--- a/src/liblzma/common/stream_encoder_mt.c
+++ b/src/liblzma/common/stream_encoder_mt.c
@@ -598,7 +598,7 @@ stream_encode_in(lzma_stream_coder *coder, const lzma_allocator *allocator,
 		}
 
 		if (block_error) {
-			lzma_ret ret;
+			lzma_ret ret = LZMA_OK; // Init to silence a warning.
 
 			mythread_sync(coder->mutex) {
 				ret = coder->thread_error;