diff --git a/lib/Target/ARM/ARMISelLowering.cpp b/lib/Target/ARM/ARMISelLowering.cpp
index d0c40229d40..333907c4fb8 100644
--- a/lib/Target/ARM/ARMISelLowering.cpp
+++ b/lib/Target/ARM/ARMISelLowering.cpp
@@ -2949,7 +2949,7 @@ static SDValue isNEONModifiedImm(uint64_t SplatBits, uint64_t SplatUndef,
   }
 
   default:
-    llvm_unreachable("unexpected size for EncodeNEONModImm");
+    llvm_unreachable("unexpected size for isNEONModifiedImm");
     return SDValue();
   }