diff --git a/clang-tools-extra/clang-tidy/readability/SimplifyBooleanExprMatchers.h b/clang-tools-extra/clang-tidy/readability/SimplifyBooleanExprMatchers.h
index 62fc9cfcaa1d3..0b11b0d1e6b4c 100644
--- a/clang-tools-extra/clang-tidy/readability/SimplifyBooleanExprMatchers.h
+++ b/clang-tools-extra/clang-tidy/readability/SimplifyBooleanExprMatchers.h
@@ -6,6 +6,7 @@
 //
 //===----------------------------------------------------------------------===//
 
+#include "clang/ASTMatchers/ASTMatchersInternal.h"
 #include "clang/ASTMatchers/ASTMatchersMacros.h"
 
 namespace clang {