diff --git a/include/eld/Fragment/RegionFragmentEx.h b/include/eld/Fragment/RegionFragmentEx.h
index fc865a12b..43a0ce4d4 100644
--- a/include/eld/Fragment/RegionFragmentEx.h
+++ b/include/eld/Fragment/RegionFragmentEx.h
@@ -36,7 +36,7 @@ class RegionFragmentEx : public Fragment {
 
   static bool classof(const RegionFragmentEx *) { return true; }
 
-  bool replaceInstruction(uint32_t Offset, Relocation *Reloc, uint32_t Instr,
+  bool replaceInstruction(uint32_t Offset, Relocation *Reloc, uint64_t Instr,
                           uint8_t Size);
   void deleteInstruction(uint32_t Offset, uint32_t Size);
   void addRequiredNops(uint32_t Offset, uint32_t NumNopsToAdd);
diff --git a/lib/Fragment/RegionFragmentEx.cpp b/lib/Fragment/RegionFragmentEx.cpp
index 5b0eb431a..ffe24986b 100644
--- a/lib/Fragment/RegionFragmentEx.cpp
+++ b/lib/Fragment/RegionFragmentEx.cpp
@@ -22,7 +22,7 @@ RegionFragmentEx::RegionFragmentEx(const char *Buf, size_t Sz, ELFSection *O,
 RegionFragmentEx::~RegionFragmentEx() {}
 
 bool RegionFragmentEx::replaceInstruction(uint32_t Offset, Relocation *Reloc,
-                                          uint32_t Instr, uint8_t Size) {
+                                          uint64_t Instr, uint8_t Size) {
   std::memcpy((void *)(Data + Offset), &Instr, Size);
   return true;
 }