diff --git a/clang-tools-extra/clangd/index/CanonicalIncludes.cpp b/clang-tools-extra/clangd/index/CanonicalIncludes.cpp
--- a/clang-tools-extra/clangd/index/CanonicalIncludes.cpp
+++ b/clang-tools-extra/clangd/index/CanonicalIncludes.cpp
@@ -237,6 +237,7 @@
       {"bits/random.h", "<random>"},
       {"bits/random.tcc", "<random>"},
       {"bits/range_access.h", "<iterator>"},
+      {"bits/ranges_algo.h", "<algorithm>"},
       {"bits/refwrap.h", "<functional>"},
       {"bits/regex.h", "<regex>"},
       {"bits/regex_automaton.h", "<regex>"},