diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 6032e16bc..4ad978a4b 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -278,6 +278,7 @@ static size_t ZSTD_resetCCtx_advanced (ZSTD_CCtx* zc,
             size_t const neededSpace = tableSpace + (256*sizeof(U32)) /* huffTable */ + tokenSpace
                                   + (((params.cParams.strategy == ZSTD_btopt) || (params.cParams.strategy == ZSTD_btopt2)) ? optSpace : 0);
             if (zc->workSpaceSize < neededSpace) {
+                zc->workSpaceSize = 0;
                 ZSTD_free(zc->workSpace, zc->customMem);
                 zc->workSpace = ZSTD_malloc(neededSpace, zc->customMem);
                 if (zc->workSpace == NULL) return ERROR(memory_allocation);