diff --git a/lib/Target/X86/X86TargetMachine.cpp b/lib/Target/X86/X86TargetMachine.cpp
index f1f003b..a2efb03 100644
--- a/lib/Target/X86/X86TargetMachine.cpp
+++ b/lib/Target/X86/X86TargetMachine.cpp
@@ -68,6 +68,9 @@
   // FIXME: Implement the switch instruction in the instruction selector!
   PM.add(createLowerSwitchPass());
 
+  // Make sure that no unreachable blocks are instruction selected.
+  PM.add(createUnreachableBlockEliminationPass());
+
   if (NoPatternISel && NoSimpleISel)
     PM.add(createX86SimpleInstructionSelector(*this));
   else if (NoPatternISel)
@@ -125,6 +128,9 @@
   // FIXME: Implement the switch instruction in the instruction selector!
   PM.add(createLowerSwitchPass());
 
+  // Make sure that no unreachable blocks are instruction selected.
+  PM.add(createUnreachableBlockEliminationPass());
+
   if (NoPatternISel)
     PM.add(createX86SimpleInstructionSelector(TM));
   else