diff --git a/src/elf.cpp b/src/elf.cpp
index ba01c50..8c11a5d 100644
--- a/src/elf.cpp
+++ b/src/elf.cpp
@@ -1,3 +1,5 @@
+#include <optional>
+
 #include "fmt/format.h"
 // #include "fmt/ostream.h"
 
diff --git a/src/mod_symbols.cpp b/src/mod_symbols.cpp
index 1001fe9..83f362b 100644
--- a/src/mod_symbols.cpp
+++ b/src/mod_symbols.cpp
@@ -1,3 +1,5 @@
+#include <cstring>
+
 #include "n64recomp.h"
 
 struct FileHeader {