diff --git a/tools/libclang/CIndexCodeCompletion.cpp b/tools/libclang/CIndexCodeCompletion.cpp
index 456c477..c1ee609 100644
--- a/tools/libclang/CIndexCodeCompletion.cpp
+++ b/tools/libclang/CIndexCodeCompletion.cpp
@@ -825,6 +825,12 @@
   CodeCompleteAtInfo CCAI = { TU, complete_filename, complete_line,
                               complete_column, unsaved_files, num_unsaved_files,
                               options, 0 };
+
+  if (getenv("LIBCLANG_NOTHREADS")) {
+    clang_codeCompleteAt_Impl(&CCAI);
+    return CCAI.result;
+  }
+
   llvm::CrashRecoveryContext CRC;
 
   if (!RunSafely(CRC, clang_codeCompleteAt_Impl, &CCAI)) {