diff --git a/library/platform.c b/library/platform.c
index 9051d51..8ea485d 100644
--- a/library/platform.c
+++ b/library/platform.c
@@ -96,7 +96,7 @@
     return( 0 );
 }
 
-#define POLARSSL_PLATFORM_STD_fPRINTF   platform_fprintf_uninit
+#define POLARSSL_PLATFORM_STD_FPRINTF   platform_fprintf_uninit
 #endif /* !POLARSSL_PLATFORM_STD_FPRINTF */
 
 int (*polarssl_fprintf)( FILE *, const char *, ... ) =