diff --git a/lib/decompress/zstd_decompress.c b/lib/decompress/zstd_decompress.c
index ff791969e..152d16a5a 100644
--- a/lib/decompress/zstd_decompress.c
+++ b/lib/decompress/zstd_decompress.c
@@ -198,6 +198,7 @@ ZSTD_DCtx* ZSTD_createDCtx_advanced(ZSTD_customMem customMem)
         if (!dctx) return NULL;
         dctx->customMem = customMem;
         dctx->legacyContext = NULL;
+        dctx->previousLegacyVersion = 0;
         ZSTD_initDCtx_internal(dctx);
         return dctx;
     }