diff --git a/src/elements-kind.cc b/src/elements-kind.cc
index 0d29c30..7bb75c4 100644
--- a/src/elements-kind.cc
+++ b/src/elements-kind.cc
@@ -37,7 +37,12 @@
     case DICTIONARY_ELEMENTS:
     case FAST_SLOPPY_ARGUMENTS_ELEMENTS:
     case SLOW_SLOPPY_ARGUMENTS_ELEMENTS:
+    case FAST_STRING_WRAPPER_ELEMENTS:
+    case SLOW_STRING_WRAPPER_ELEMENTS:
       return kPointerSizeLog2;
+    case NO_ELEMENTS:
+      UNREACHABLE();
+      return 0;
   }
   UNREACHABLE();
   return 0;