diff --git a/impeller/typographer/font_glyph_pair.h b/impeller/typographer/font_glyph_pair.h
index 60be5b8f88293..00b59411d3308 100644
--- a/impeller/typographer/font_glyph_pair.h
+++ b/impeller/typographer/font_glyph_pair.h
@@ -5,6 +5,7 @@
 #pragma once
 
 #include <optional>
+#include <unordered_map>
 #include <unordered_set>
 #include <vector>