diff --git a/lldb/unittests/TestingSupport/MockTildeExpressionResolver.cpp b/lldb/unittests/TestingSupport/MockTildeExpressionResolver.cpp
index 2e103b9e61f1f..b34e01bd01a05 100644
--- a/lldb/unittests/TestingSupport/MockTildeExpressionResolver.cpp
+++ b/lldb/unittests/TestingSupport/MockTildeExpressionResolver.cpp
@@ -7,6 +7,7 @@
 //===----------------------------------------------------------------------===//
 
 #include "MockTildeExpressionResolver.h"
+#include "llvm/ADT/STLExtras.h"
 #include "llvm/Support/Path.h"
 
 using namespace lldb_private;