diff --git a/mlir/include/mlir/Support/LLVM.h b/mlir/include/mlir/Support/LLVM.h
index 885521037f214c..b8f6bbeba94d97 100644
--- a/mlir/include/mlir/Support/LLVM.h
+++ b/mlir/include/mlir/Support/LLVM.h
@@ -27,6 +27,7 @@
 // Workaround for clang-5 (PR41549)
 #if defined(__clang_major__)
 #if __clang_major__ <= 5
+#include "llvm/ADT/DenseMapInfo.h"
 #include "llvm/ADT/SmallVector.h"
 #endif
 #endif