diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
index ea69342709c9..f9c34a24be99 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.cpp
@@ -104,7 +104,7 @@ unsigned PPCMCCodeEmitter::getImm16Encoding(const MCInst &MI, unsigned OpNo,
   return 0;
 }
 
-unsigned long
+uint64_t
 PPCMCCodeEmitter::getImm34Encoding(const MCInst &MI, unsigned OpNo,
                                    SmallVectorImpl<MCFixup> &Fixups,
                                    const MCSubtargetInfo &STI) const {
diff --git a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.h b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.h
index bad4e9646967..588aa76bd806 100644
--- a/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.h
+++ b/llvm/lib/Target/PowerPC/MCTargetDesc/PPCMCCodeEmitter.h
@@ -50,9 +50,9 @@ public:
   unsigned getImm16Encoding(const MCInst &MI, unsigned OpNo,
                             SmallVectorImpl<MCFixup> &Fixups,
                             const MCSubtargetInfo &STI) const;
-  unsigned long getImm34Encoding(const MCInst &MI, unsigned OpNo,
-                                 SmallVectorImpl<MCFixup> &Fixups,
-                                 const MCSubtargetInfo &STI) const;
+  uint64_t getImm34Encoding(const MCInst &MI, unsigned OpNo,
+                            SmallVectorImpl<MCFixup> &Fixups,
+                            const MCSubtargetInfo &STI) const;
   unsigned getMemRIEncoding(const MCInst &MI, unsigned OpNo,
                             SmallVectorImpl<MCFixup> &Fixups,
                             const MCSubtargetInfo &STI) const;