diff --git a/include/psa/crypto_builtin_composites.h b/include/psa/crypto_builtin_composites.h
index 6979dec42..f968c169e 100644
--- a/include/psa/crypto_builtin_composites.h
+++ b/include/psa/crypto_builtin_composites.h
@@ -62,7 +62,6 @@ typedef struct
 typedef struct
 {
     psa_algorithm_t alg;
-    unsigned int has_input : 1;
     unsigned int is_sign : 1;
     uint8_t mac_size;
     union
diff --git a/library/psa_crypto_mac.c b/library/psa_crypto_mac.c
index a5ef9e57d..dc07d455e 100644
--- a/library/psa_crypto_mac.c
+++ b/library/psa_crypto_mac.c
@@ -230,7 +230,6 @@ static psa_status_t mac_init(
     psa_status_t status = PSA_ERROR_CORRUPTION_DETECTED;
 
     operation->alg = PSA_ALG_FULL_LENGTH_MAC( alg );
-    operation->has_input = 0;
     operation->is_sign = 0;
 
 #if defined(BUILTIN_ALG_CMAC)
@@ -290,7 +289,6 @@ static psa_status_t mac_abort( mbedtls_psa_mac_operation_t *operation )
     }
 
     operation->alg = 0;
-    operation->has_input = 0;
     operation->is_sign = 0;
 
     return( PSA_SUCCESS );
@@ -425,7 +423,6 @@ static psa_status_t mac_update(
 {
     if( operation->alg == 0 )
         return( PSA_ERROR_BAD_STATE );
-    operation->has_input = 1;
 
 #if defined(BUILTIN_ALG_CMAC)
     if( operation->alg == PSA_ALG_CMAC )