diff --git a/tools/libclang/CIndex.cpp b/tools/libclang/CIndex.cpp
index 554edd8..f419062 100644
--- a/tools/libclang/CIndex.cpp
+++ b/tools/libclang/CIndex.cpp
@@ -1965,7 +1965,8 @@
 }
 
 unsigned clang_defaultEditingTranslationUnitOptions() {
-  return CXTranslationUnit_PrecompiledPreamble;
+  return CXTranslationUnit_PrecompiledPreamble | 
+         CXTranslationUnit_CacheCompletionResults;
 }
   
 CXTranslationUnit