diff --git a/lib/common/compiler.h b/lib/common/compiler.h
index 5e70570ec7a..67c070fa6ba 100644
--- a/lib/common/compiler.h
+++ b/lib/common/compiler.h
@@ -117,6 +117,17 @@
 #  endif
 #endif
 
+/* portable `restrict` qualifier */
+#ifndef ZSTD_RESTRICT
+#  if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && !defined(__cplusplus)
+#    define ZSTD_RESTRICT restrict
+#  elif defined(__GNUC__) || defined(__clang__)
+#    define ZSTD_RESTRICT __restrict__
+#  else
+#    define ZSTD_RESTRICT
+#  endif
+#endif
+
 
 /* target attribute */
 #if defined(__GNUC__) || defined(__IAR_SYSTEMS_ICC__)
diff --git a/lib/compress/zstd_lazy.c b/lib/compress/zstd_lazy.c
index 18b7b43948f..f3e6a49c106 100644
--- a/lib/compress/zstd_lazy.c
+++ b/lib/compress/zstd_lazy.c
@@ -1183,9 +1183,9 @@ ZSTD_row_getMatchMask(const BYTE* const tagRow, const BYTE tag, const U32 headGr
 FORCE_INLINE_TEMPLATE
 ZSTD_ALLOW_POINTER_OVERFLOW_ATTR
 size_t ZSTD_RowFindBestMatch(
-                        ZSTD_MatchState_t* ms,
-                        const BYTE* const ip, const BYTE* const iLimit,
-                        size_t* offsetPtr,
+                        ZSTD_MatchState_t* ZSTD_RESTRICT ms,
+                        const BYTE* const ZSTD_RESTRICT ip, const BYTE* const iLimit,
+                        size_t* ZSTD_RESTRICT offsetPtr,
                         const U32 mls, const ZSTD_dictMode_e dictMode,
                         const U32 rowLog)
 {