diff --git a/lib/Target/ARM/ARMConstantIslandPass.cpp b/lib/Target/ARM/ARMConstantIslandPass.cpp
index e6f49ab86f0..1828cbb696b 100644
--- a/lib/Target/ARM/ARMConstantIslandPass.cpp
+++ b/lib/Target/ARM/ARMConstantIslandPass.cpp
@@ -834,6 +834,7 @@ unsigned ARMConstantIslands::GetOffsetOf(MachineInstr *MI) const {
     if (&*I == MI) return Offset;
     Offset += TII->GetInstSizeInBytes(I);
   }
+  // Unreachable.
 }
 
 /// CompareMBBNumbers - Little predicate function to sort the WaterList by MBB