diff --git a/fml/ascii_trie.h b/fml/ascii_trie.h
index e6ff430a08e4f..eafbeec8bba91 100644
--- a/fml/ascii_trie.h
+++ b/fml/ascii_trie.h
@@ -5,6 +5,7 @@
 #ifndef FLUTTER_FML_ASCIITRIE_H_
 #define FLUTTER_FML_ASCIITRIE_H_
 
+#include <memory>
 #include <string>
 #include <vector>