diff --git a/wolfssl/wolfio.h b/wolfssl/wolfio.h
index 69c3d072b..0efa1a803 100644
--- a/wolfssl/wolfio.h
+++ b/wolfssl/wolfio.h
@@ -66,7 +66,7 @@
         #include "cmsis_os.h"
         #include "rl_net.h"
         #include "errno.h"
-	#elif defined(WOLFSSL_CMSIS_RTOS)
+    #elif defined(WOLFSSL_CMSIS_RTOS)
         #include "cmsis_os.h"
     #elif defined(WOLFSSL_TIRTOS)
         #include <sys/socket.h>