diff --git a/lib/Target/ARM/ARMFastISel.cpp b/lib/Target/ARM/ARMFastISel.cpp
index de6a03cde5c..a81917638bb 100644
--- a/lib/Target/ARM/ARMFastISel.cpp
+++ b/lib/Target/ARM/ARMFastISel.cpp
@@ -73,7 +73,7 @@ namespace {
      }
   } Address;
 
-class ARMFastISel : public FastISel {
+class ARMFastISel final : public FastISel {
 
   /// Subtarget - Keep a pointer to the ARMSubtarget around so that we can
   /// make the right decision when generating code for different targets.
diff --git a/lib/Target/PowerPC/PPCFastISel.cpp b/lib/Target/PowerPC/PPCFastISel.cpp
index aedee7c207f..e0c89fa8ce8 100644
--- a/lib/Target/PowerPC/PPCFastISel.cpp
+++ b/lib/Target/PowerPC/PPCFastISel.cpp
@@ -80,7 +80,7 @@ typedef struct Address {
    }
 } Address;
 
-class PPCFastISel : public FastISel {
+class PPCFastISel final : public FastISel {
 
   const TargetMachine &TM;
   const TargetInstrInfo &TII;
diff --git a/lib/Target/X86/X86FastISel.cpp b/lib/Target/X86/X86FastISel.cpp
index 2a0eb247dd5..0751af45e33 100644
--- a/lib/Target/X86/X86FastISel.cpp
+++ b/lib/Target/X86/X86FastISel.cpp
@@ -41,7 +41,7 @@ using namespace llvm;
 
 namespace {
 
-class X86FastISel : public FastISel {
+class X86FastISel final : public FastISel {
   /// Subtarget - Keep a pointer to the X86Subtarget around so that we can
   /// make the right decision when generating code for different targets.
   const X86Subtarget *Subtarget;