diff --git a/clang-tools-extra/clang-tidy/GlobList.cpp b/clang-tools-extra/clang-tidy/GlobList.cpp
index 88e6ea22d675c7..5b70b8d8c57718 100644
--- a/clang-tools-extra/clang-tidy/GlobList.cpp
+++ b/clang-tools-extra/clang-tidy/GlobList.cpp
@@ -52,7 +52,7 @@ GlobList::GlobList(StringRef Globs) {
   } while (!Globs.empty());
 }
 
-bool GlobList::contains(StringRef S) {
+bool GlobList::contains(StringRef S) const {
   // Iterating the container backwards as the last match determins if S is in
   // the list.
   for (const GlobListItem &Item : llvm::reverse(Items)) {
diff --git a/clang-tools-extra/clang-tidy/GlobList.h b/clang-tools-extra/clang-tidy/GlobList.h
index 5acb6a5b878cbb..fe68a3497c92ab 100644
--- a/clang-tools-extra/clang-tidy/GlobList.h
+++ b/clang-tools-extra/clang-tidy/GlobList.h
@@ -33,7 +33,7 @@ class GlobList {
 
   /// Returns \c true if the pattern matches \p S. The result is the last
   /// matching glob's Positive flag.
-  bool contains(StringRef S);
+  bool contains(StringRef S) const;
 
 private: