diff --git a/include/mbedtls/arc4.h b/include/mbedtls/arc4.h
index 17728f4..f4b0f9f 100644
--- a/include/mbedtls/arc4.h
+++ b/include/mbedtls/arc4.h
@@ -35,7 +35,8 @@
 #include <stddef.h>
 
 /* MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED is deprecated and should not be used. */
-#define MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED                  -0x0019  /**< ARC4 hardware accelerator failed. */
+/** ARC4 hardware accelerator failed. */
+#define MBEDTLS_ERR_ARC4_HW_ACCEL_FAILED                  -0x0019
 
 #ifdef __cplusplus
 extern "C" {