diff --git a/cyassl/ctaocrypt/settings.h b/cyassl/ctaocrypt/settings.h
index a617400a0..678d03294 100644
--- a/cyassl/ctaocrypt/settings.h
+++ b/cyassl/ctaocrypt/settings.h
@@ -158,8 +158,15 @@
     #define NO_DEV_RANDOM
     #define NO_CYASSL_DIR
     #define NO_RABBIT
+    #ifndef NO_FILESYSTEM
+        #define LSR_FS
+        #include "fs.h"
+    #endif
     #define CYASSL_LWIP
     #define CYASSL_SAFERTOS
+#endif
+
+#ifdef CYASSL_SAFERTOS
     #ifndef SINGLE_THREADED
         #include "SafeRTOS/semphr.h"
     #endif
diff --git a/src/ssl.c b/src/ssl.c
index c2dc26931..875dccae6 100644
--- a/src/ssl.c
+++ b/src/ssl.c
@@ -1214,17 +1214,18 @@ static int ProcessChainBuffer(CYASSL_CTX* ctx, const unsigned char* buff,
     #define XFCLOSE                  vf_close
     #define XSEEK_END                VSEEK_END
     #define XBADFILE                 -1
-#elif !defined(MICRIUM)
-    #define XFILE      FILE*
-    #define XFOPEN     fopen 
-    #define XFSEEK     fseek
-    #define XFTELL     ftell
-    #define XREWIND    rewind
-    #define XFREAD     fread
-    #define XFCLOSE    fclose
-    #define XSEEK_END  SEEK_END
-    #define XBADFILE   NULL
-#else
+#elif defined(LSR_FS)
+    #include <fs.h>
+    #define XFILE                   struct fs_file*
+    #define XFOPEN(NAME, MODE)      fs_open(NAME);
+    #define XFSEEK
+    #define XFTELL(F)               (F)->len
+    #define XREWIND
+    #define XFREAD(BUF, SZ, AMT, F) fs_read(F, BUF, SZ*AMT)
+    #define XFCLOSE                 fs_close
+    #define XSEEK_END               0
+    #define XBADFILE                NULL
+#elif defined(MICRIUM)
     #include <fs.h>
     #define XFILE      FS_FILE*
     #define XFOPEN     fs_fopen 
@@ -1235,6 +1236,17 @@ static int ProcessChainBuffer(CYASSL_CTX* ctx, const unsigned char* buff,
     #define XFCLOSE    fs_fclose
     #define XSEEK_END  FS_SEEK_END
     #define XBADFILE   NULL
+#else
+    /* stdio, default case */
+    #define XFILE      FILE*
+    #define XFOPEN     fopen 
+    #define XFSEEK     fseek
+    #define XFTELL     ftell
+    #define XREWIND    rewind
+    #define XFREAD     fread
+    #define XFCLOSE    fclose
+    #define XSEEK_END  SEEK_END
+    #define XBADFILE   NULL
 #endif