diff --git a/runtime/mirror/string-inl.h b/runtime/mirror/string-inl.h
index 9b8445d..c2407d7 100644
--- a/runtime/mirror/string-inl.h
+++ b/runtime/mirror/string-inl.h
@@ -308,7 +308,7 @@
 }
 
 template<typename MemoryType>
-bool String::AllASCII(const MemoryType* const chars, const int length) {
+inline bool String::AllASCII(const MemoryType* chars, const int length) {
   static_assert(std::is_unsigned<MemoryType>::value, "Expecting unsigned MemoryType");
   for (int i = 0; i < length; ++i) {
     // Valid ASCII characters are in range 1..0x7f. Zero is not considered ASCII
@@ -320,6 +320,13 @@
   return true;
 }
 
+inline bool String::DexFileStringAllASCII(const char* chars, const int length) {
+  // For strings from the dex file we just need to check that
+  // the terminating character is at the right position.
+  DCHECK_EQ(AllASCII(reinterpret_cast<const uint8_t*>(chars), length), chars[length] == 0);
+  return chars[length] == 0;
+}
+
 }  // namespace mirror
 }  // namespace art