diff --git a/boot/zephyr/include/config-rsa.h b/boot/zephyr/include/config-rsa.h
index d27acf9..f6bba7e 100644
--- a/boot/zephyr/include/config-rsa.h
+++ b/boot/zephyr/include/config-rsa.h
@@ -38,10 +38,13 @@
 #define MBEDTLS_PLATFORM_C
 #define MBEDTLS_PLATFORM_MEMORY
 #define MBEDTLS_MEMORY_BUFFER_ALLOC_C
-#define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
-#define MBEDTLS_PLATFORM_EXIT_ALT
 #define MBEDTLS_NO_PLATFORM_ENTROPY
 #define MBEDTLS_NO_DEFAULT_ENTROPY_SOURCES
+
+/* STD functions */
+#define MBEDTLS_PLATFORM_NO_STD_FUNCTIONS
+
+#define MBEDTLS_PLATFORM_EXIT_ALT
 #define MBEDTLS_PLATFORM_PRINTF_ALT
 
 #if !defined(CONFIG_ARM)