diff --git a/include/llvm/DebugInfo/DWARF/DWARFUnit.h b/include/llvm/DebugInfo/DWARF/DWARFUnit.h
index da513bf7443..9c3fe3be6aa 100644
--- a/include/llvm/DebugInfo/DWARF/DWARFUnit.h
+++ b/include/llvm/DebugInfo/DWARF/DWARFUnit.h
@@ -247,7 +247,7 @@ public:
   /// \brief Return the DIE object for a given offset inside the
   /// unit's DIE vector.
   ///
-  /// The unit needs to have his DIEs extracted for this method to work.
+  /// The unit needs to have its DIEs extracted for this method to work.
   const DWARFDebugInfoEntryMinimal *getDIEForOffset(uint32_t Offset) const {
     assert(!DieArray.empty());
     auto it = std::lower_bound(
diff --git a/lib/Target/Mips/MipsFastISel.cpp b/lib/Target/Mips/MipsFastISel.cpp
index acb458d303a..afcf5f8bd80 100644
--- a/lib/Target/Mips/MipsFastISel.cpp
+++ b/lib/Target/Mips/MipsFastISel.cpp
@@ -956,7 +956,7 @@ bool MipsFastISel::selectFPExt(const Instruction *I) {
     return false;
 
   unsigned SrcReg =
-      getRegForValue(Src); // his must be a 32 bit floating point register class
+      getRegForValue(Src); // this must be a 32bit floating point register class
                            // maybe we should handle this differently
   if (!SrcReg)
     return false;
diff --git a/lib/Transforms/Scalar/LoopDataPrefetch.cpp b/lib/Transforms/Scalar/LoopDataPrefetch.cpp
index 6aea79fe5a3..0c5325405d8 100644
--- a/lib/Transforms/Scalar/LoopDataPrefetch.cpp
+++ b/lib/Transforms/Scalar/LoopDataPrefetch.cpp
@@ -189,7 +189,7 @@ bool LoopDataPrefetch::runOnLoop(Loop *L) {
        I != IE; ++I) {
 
     // If the loop already has prefetches, then assume that the user knows
-    // what he or she is doing and don't add any more.
+    // what they are doing and don't add any more.
     for (BasicBlock::iterator J = (*I)->begin(), JE = (*I)->end();
          J != JE; ++J)
       if (CallInst *CI = dyn_cast<CallInst>(J))