diff --git a/Sources/Plasma/CoreLib/hsUtils.h b/Sources/Plasma/CoreLib/hsUtils.h
index ab46d9c5..339e7395 100644
--- a/Sources/Plasma/CoreLib/hsUtils.h
+++ b/Sources/Plasma/CoreLib/hsUtils.h
@@ -50,6 +50,7 @@ char *  hsFormatStrV(const char * fmt, va_list args);   // You are responsible f
 #define strnicmp _strnicmp
 #define wcsicmp _wcsicmp
 #define wcsnicmp _wcsnicmp
+#define strlwr _strlwr
 #else
 #define stricmp strcasecmp
 #define strnicmp strncasecmp
diff --git a/Sources/Plasma/PubUtilLib/plFile/plFileUtils.cpp b/Sources/Plasma/PubUtilLib/plFile/plFileUtils.cpp
index 3f5c1e1e..efa6f60b 100644
--- a/Sources/Plasma/PubUtilLib/plFile/plFileUtils.cpp
+++ b/Sources/Plasma/PubUtilLib/plFile/plFileUtils.cpp
@@ -54,6 +54,11 @@ You can contact Cyan Worlds, Inc. by email legal@cyan.com
 #if HS_BUILD_FOR_WIN32
 #include <direct.h>
 #include <io.h>
+#define mkdir _mkdir
+#define chdir _chdir
+#define chmod _chmod
+#define rmdir _rmdir
+#define unlink _unlink
 #endif
 
 #if HS_BUILD_FOR_UNIX