diff --git a/components/esp8266/include/esp_libc.h b/components/esp8266/include/esp_libc.h
index bd979c90..ab4d0d04 100644
--- a/components/esp8266/include/esp_libc.h
+++ b/components/esp8266/include/esp_libc.h
@@ -73,11 +73,7 @@ unsigned long os_random(void);
 int os_get_random(unsigned char *buf, size_t len);
 
 #ifndef os_printf
-/* NOTE: don't use printf_opt in irq handler, for test */
-#define os_printf(fmt, ...) do {    \
-        static const char flash_str[] ICACHE_RODATA_ATTR STORE_ATTR = fmt;  \
-        printf(flash_str, ##__VA_ARGS__);   \
-    } while(0)
+#define os_printf   printf
 #endif
 
 /* Note: check_memleak_debug_enable is a weak function inside SDK.
diff --git a/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h b/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h
index 4403c420..77ac7478 100644
--- a/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h
+++ b/components/ssl/mbedtls/port/openssl/include/platform/ssl_port.h
@@ -63,14 +63,7 @@ extern void vPortFree(void *pv);
 #define ssl_speed_up_enter() system_update_cpu_freq(SYS_CPU_160MHZ)
 #define ssl_speed_up_exit()  system_update_cpu_freq(SYS_CPU_80MHZ)
 
-#ifndef os_printf
-#define os_printf(fmt, ...) do {    \
-        static const char flash_str[] ICACHE_RODATA_ATTR STORE_ATTR = fmt;  \
-        printf(flash_str, ##__VA_ARGS__);   \
-    } while(0)
-#endif
-
-#define SSL_DEBUG_LOG os_printf
+#define SSL_DEBUG_LOG printf
 
 #define LOCAL_ATRR ICACHE_RODATA_ATTR STORE_ATTR