diff --git a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
index 4f20096c1583..2e43c6a66253 100644
--- a/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
+++ b/llvm/lib/Target/WebAssembly/MCTargetDesc/WebAssemblyAsmBackend.cpp
@@ -37,7 +37,7 @@ public:
       : MCAsmBackend(), Is64Bit(Is64Bit) {}
   ~WebAssemblyAsmBackendELF() override {}
 
-  void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
+  void applyFixup(const MCFixup &Fixup, MutableArrayRef<char> Data,
                   uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;
@@ -77,7 +77,7 @@ public:
 
   const MCFixupKindInfo &getFixupKindInfo(MCFixupKind Kind) const override;
 
-  void applyFixup(const MCFixup &Fixup, char *Data, unsigned DataSize,
+  void applyFixup(const MCFixup &Fixup, MutableArrayRef<char> Data,
                   uint64_t Value, bool IsPCRel, MCContext &Ctx) const override;
 
   MCObjectWriter *createObjectWriter(raw_pwrite_stream &OS) const override;
@@ -105,9 +105,10 @@ bool WebAssemblyAsmBackendELF::writeNopData(uint64_t Count,
   return true;
 }
 
-void WebAssemblyAsmBackendELF::applyFixup(const MCFixup &Fixup, char *Data,
-                                          unsigned DataSize, uint64_t Value,
-                                          bool IsPCRel, MCContext &Ctx) const {
+void WebAssemblyAsmBackendELF::applyFixup(const MCFixup &Fixup,
+                                          MutableArrayRef<char> Data,
+                                          uint64_t Value, bool IsPCRel,
+                                          MCContext &Ctx) const {
   const MCFixupKindInfo &Info = getFixupKindInfo(Fixup.getKind());
   assert(Info.Flags == 0 && "WebAssembly does not use MCFixupKindInfo flags");
 
@@ -119,7 +120,7 @@ void WebAssemblyAsmBackendELF::applyFixup(const MCFixup &Fixup, char *Data,
   Value <<= Info.TargetOffset;
 
   unsigned Offset = Fixup.getOffset();
-  assert(Offset + NumBytes <= DataSize && "Invalid fixup offset!");
+  assert(Offset + NumBytes <= Data.size() && "Invalid fixup offset!");
 
   // For each byte of the fragment that the fixup touches, mask in the
   // bits from the fixup value.
@@ -163,9 +164,10 @@ bool WebAssemblyAsmBackend::writeNopData(uint64_t Count,
   return true;
 }
 
-void WebAssemblyAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
-                                       unsigned DataSize, uint64_t Value,
-                                       bool IsPCRel, MCContext &Ctx) const {
+void WebAssemblyAsmBackend::applyFixup(const MCFixup &Fixup,
+                                       MutableArrayRef<char> Data,
+                                       uint64_t Value, bool IsPCRel,
+                                       MCContext &Ctx) const {
   const MCFixupKindInfo &Info = getFixupKindInfo(Fixup.getKind());
   assert(Info.Flags == 0 && "WebAssembly does not use MCFixupKindInfo flags");
 
@@ -177,7 +179,7 @@ void WebAssemblyAsmBackend::applyFixup(const MCFixup &Fixup, char *Data,
   Value <<= Info.TargetOffset;
 
   unsigned Offset = Fixup.getOffset();
-  assert(Offset + NumBytes <= DataSize && "Invalid fixup offset!");
+  assert(Offset + NumBytes <= Data.size() && "Invalid fixup offset!");
 
   // For each byte of the fragment that the fixup touches, mask in the
   // bits from the fixup value.