diff --git a/Source/Core/Core/ec_wii.cpp b/Source/Core/Core/ec_wii.cpp
index 7237512b860a..9049b0a493f3 100644
--- a/Source/Core/Core/ec_wii.cpp
+++ b/Source/Core/Core/ec_wii.cpp
@@ -12,6 +12,7 @@
 #include <cinttypes>
 #include <cstdio>
 #include <cstring>
+#include <string>
 
 #include <mbedtls/sha1.h>