diff --git a/Elf2Mac/Symtab.h b/Elf2Mac/Symtab.h
index d5774c9d02..4ec46351ba 100644
--- a/Elf2Mac/Symtab.h
+++ b/Elf2Mac/Symtab.h
@@ -25,6 +25,7 @@
 #include <vector>
 #include <map>
 #include <unordered_map>
+#include <string>
 
 class Object;
 class Symbol;