diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index b1d799cdc..848472ec4 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -3153,7 +3153,7 @@ size_t ZSTD_estimateCStreamSize(ZSTD_compressionParameters cParams)
     size_t const outBuffSize = ZSTD_compressBound(blockSize) + 1;
     size_t const streamingSize = inBuffSize + outBuffSize;
 
-    return sizeof(ZSTD_CCtx) + CCtxSize + streamingSize;
+    return CCtxSize + streamingSize;
 }