diff --git a/lib/decompress/zstd_decompress.c b/lib/decompress/zstd_decompress.c
index 00b069e9f..90c76faeb 100644
--- a/lib/decompress/zstd_decompress.c
+++ b/lib/decompress/zstd_decompress.c
@@ -880,7 +880,7 @@ size_t ZSTD_execSequence(BYTE* op,
             sequence.matchLength -= length1;
             match = base;
             if (op > oend_w) {
-              memmove(op, match, sequence.matchLength);
+              while (op < oMatchEnd) *op++ = *match++;
               return sequenceLength;
             }
     }   }
diff --git a/lib/legacy/zstd_v04.c b/lib/legacy/zstd_v04.c
index 05e40aac5..a2332d933 100644
--- a/lib/legacy/zstd_v04.c
+++ b/lib/legacy/zstd_v04.c
@@ -3108,7 +3108,7 @@ static size_t ZSTD_execSequence(BYTE* op,
             sequence.matchLength -= length1;
             match = base;
             if (op > oend_8) {
-              memmove(op, match, sequence.matchLength);
+              while (op < oMatchEnd) *op++ = *match++;
               return sequenceLength;
             }
         }
diff --git a/lib/legacy/zstd_v05.c b/lib/legacy/zstd_v05.c
index 3cb5bb4af..0de28c983 100644
--- a/lib/legacy/zstd_v05.c
+++ b/lib/legacy/zstd_v05.c
@@ -2036,7 +2036,7 @@ size_t HUFv05_decompress1X2_usingDTable(
     const void* dtPtr = DTable;
     const HUFv05_DEltX2* const dt = ((const HUFv05_DEltX2*)dtPtr)+1;
     BITv05_DStream_t bitD;
-    
+
     if (dstSize <= cSrcSize) return ERROR(dstSize_tooSmall);
     { size_t const errorCode = BITv05_initDStream(&bitD, cSrc, cSrcSize);
       if (HUFv05_isError(errorCode)) return errorCode; }
@@ -3317,7 +3317,7 @@ static size_t ZSTDv05_execSequence(BYTE* op,
             sequence.matchLength -= length1;
             match = base;
             if (op > oend_8) {
-              memmove(op, match, sequence.matchLength);
+              while (op < oMatchEnd) *op++ = *match++;
               return sequenceLength;
             }
     }   }
diff --git a/lib/legacy/zstd_v06.c b/lib/legacy/zstd_v06.c
index 96a84d3e8..b1ff4be4a 100644
--- a/lib/legacy/zstd_v06.c
+++ b/lib/legacy/zstd_v06.c
@@ -3467,7 +3467,7 @@ size_t ZSTDv06_execSequence(BYTE* op,
             sequence.matchLength -= length1;
             match = base;
             if (op > oend_8) {
-              memmove(op, match, sequence.matchLength);
+              while (op < oMatchEnd) *op++ = *match++;
               return sequenceLength;
             }
     }   }
diff --git a/lib/legacy/zstd_v07.c b/lib/legacy/zstd_v07.c
index 62285238a..c679b97f2 100644
--- a/lib/legacy/zstd_v07.c
+++ b/lib/legacy/zstd_v07.c
@@ -3691,7 +3691,7 @@ size_t ZSTDv07_execSequence(BYTE* op,
             sequence.matchLength -= length1;
             match = base;
             if (op > oend_w) {
-              memmove(op, match, sequence.matchLength);
+              while (op < oMatchEnd) *op++ = *match++;
               return sequenceLength;
             }
     }   }