diff --git a/include/stdex/base64.h b/include/stdex/base64.h
index 80601580a..7a618471e 100644
--- a/include/stdex/base64.h
+++ b/include/stdex/base64.h
@@ -6,6 +6,7 @@
 #pragma once
 
 #include "sal.h"
+#include <assert.h>
 #include <cstdint>
 #include <string>
 #include <vector>
diff --git a/include/stdex/hex.h b/include/stdex/hex.h
index e882e2938..a67241afa 100644
--- a/include/stdex/hex.h
+++ b/include/stdex/hex.h
@@ -6,6 +6,7 @@
 #pragma once
 
 #include "sal.h"
+#include <assert.h>
 #include <cstdint>
 #include <string>
 #include <vector>