diff --git a/src/dynarmic/src/dynarmic/common/crypto/aes.cpp b/src/dynarmic/src/dynarmic/common/crypto/aes.cpp
index c72481fbe3..719fe539cf 100644
--- a/src/dynarmic/src/dynarmic/common/crypto/aes.cpp
+++ b/src/dynarmic/src/dynarmic/common/crypto/aes.cpp
@@ -9,6 +9,7 @@
 #include "dynarmic/common/crypto/aes.h"
 
 #include <array>
+#include <cstddef>
 
 #include "dynarmic/common/common_types.h"