diff --git a/include/mbedtls/mbedtls_config.h b/include/mbedtls/mbedtls_config.h
index 35a4a0cbd6..bfaa5f982d 100644
--- a/include/mbedtls/mbedtls_config.h
+++ b/include/mbedtls/mbedtls_config.h
@@ -328,7 +328,6 @@
 //#define MBEDTLS_SHA1_ALT
 //#define MBEDTLS_SHA256_ALT
 //#define MBEDTLS_SHA512_ALT
-//#define MBEDTLS_SHA3_ALT
 
 /*
  * When replacing the elliptic curve module, pleace consider, that it is
diff --git a/include/mbedtls/sha3.h b/include/mbedtls/sha3.h
index adecdc722f..36942db88a 100644
--- a/include/mbedtls/sha3.h
+++ b/include/mbedtls/sha3.h
@@ -55,10 +55,6 @@ typedef enum
     MBEDTLS_SHA3_512, /*!< SHA3-512 */
 } mbedtls_sha3_id;
 
-#if !defined(MBEDTLS_SHA3_ALT)
-// Regular implementation
-//
-
 struct mbedtls_sha3_context;
 typedef struct mbedtls_sha3_family_functions
 {
@@ -87,10 +83,6 @@ typedef struct mbedtls_sha3_context {
 }
 mbedtls_sha3_context;
 
-#else  /* MBEDTLS_SHA3_ALT */
-#include "sha3_alt.h"
-#endif /* MBEDTLS_SHA3_ALT */
-
 /**
  * \brief          This function initializes a SHA-3 context.
  *
diff --git a/library/sha3.c b/library/sha3.c
index d5db165fbc..4a08131e6b 100644
--- a/library/sha3.c
+++ b/library/sha3.c
@@ -44,8 +44,6 @@
 #endif /* MBEDTLS_PLATFORM_C */
 #endif /* MBEDTLS_SELF_TEST */
 
-#if !defined(MBEDTLS_SHA3_ALT)
-
 /*
  * List of supported SHA-3 families
  */
@@ -268,8 +266,6 @@ int mbedtls_sha3_finish( mbedtls_sha3_context *ctx,
     return( 0 );
 }
 
-#endif /* !MBEDTLS_SHA3_ALT */
-
 /*
  * output = SHA3( input buffer )
  */