diff --git a/Core/SVS/src/serialize.cpp b/Core/SVS/src/serialize.cpp
index 3cd2129195..4507295503 100644
--- a/Core/SVS/src/serialize.cpp
+++ b/Core/SVS/src/serialize.cpp
@@ -1,6 +1,7 @@
 #include <cstdio>
 #include <cstring>
 #include "common.h"
+#include "portability.h"
 #include "serialize.h"
 
 void serialize(const serializable& v, std::ostream& os)
diff --git a/Core/SoarKernel/src/shared/soar_instance.h b/Core/SoarKernel/src/shared/soar_instance.h
index dacf8aa9ec..dd437011ed 100644
--- a/Core/SoarKernel/src/shared/soar_instance.h
+++ b/Core/SoarKernel/src/shared/soar_instance.h
@@ -11,6 +11,7 @@
 #include "kernel.h"
 #include "Export.h"
 
+#include <string>
 #include <unordered_map>
 
 typedef void* (*MessageFunction)(const char* pMessage, void* pMessageData);