diff --git a/llvm/include/llvm/ADT/StringTable.h b/llvm/include/llvm/ADT/StringTable.h
index 9422a6da1ce8e..3a08e56e8f501 100644
--- a/llvm/include/llvm/ADT/StringTable.h
+++ b/llvm/include/llvm/ADT/StringTable.h
@@ -11,6 +11,7 @@
 
 #include "llvm/ADT/StringRef.h"
 #include "llvm/ADT/iterator.h"
+#include <cassert>
 #include <iterator>
 #include <limits>