diff --git a/lib/legacy/zstd_v01.c b/lib/legacy/zstd_v01.c
index 297eee70..746d7bbe 100644
--- a/lib/legacy/zstd_v01.c
+++ b/lib/legacy/zstd_v01.c
@@ -1557,7 +1557,7 @@ static size_t ZSTD_decodeLiteralsBlock(void* ctx,
 }
 
 
-static size_t ZSTD_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr,
+size_t ZSTD_decodeSeqHeaders(int* nbSeq, const BYTE** dumpsPtr, size_t* dumpsLengthPtr,
                          FSE_DTable* DTableLL, FSE_DTable* DTableML, FSE_DTable* DTableOffb,
                          const void* src, size_t srcSize)
 {
diff --git a/lib/legacy/zstd_v02.c b/lib/legacy/zstd_v02.c
index fd40dd04..de1592e1 100644
--- a/lib/legacy/zstd_v02.c
+++ b/lib/legacy/zstd_v02.c
@@ -13,6 +13,14 @@
 #include "error_private.h"
 
 
+/******************************************
+*  Compiler-specific
+******************************************/
+#if defined(_MSC_VER)   /* Visual Studio */
+#   include <stdlib.h>  /* _byteswap_ulong */
+#   include <intrin.h>  /* _byteswap_* */
+#endif
+
 
 /* ******************************************************************
    mem.h
diff --git a/lib/legacy/zstd_v03.c b/lib/legacy/zstd_v03.c
index 054f7761..caad331d 100644
--- a/lib/legacy/zstd_v03.c
+++ b/lib/legacy/zstd_v03.c
@@ -13,6 +13,15 @@
 #include "error_private.h"
 
 
+/******************************************
+*  Compiler-specific
+******************************************/
+#if defined(_MSC_VER)   /* Visual Studio */
+#   include <stdlib.h>  /* _byteswap_ulong */
+#   include <intrin.h>  /* _byteswap_* */
+#endif
+
+
 
 /* ******************************************************************
    mem.h