diff --git a/include/psa/crypto.h b/include/psa/crypto.h
index 204ac26..4a46eb8 100644
--- a/include/psa/crypto.h
+++ b/include/psa/crypto.h
@@ -366,9 +366,6 @@
 /** Whether a key type is vendor-defined. */
 #define PSA_KEY_TYPE_IS_VENDOR_DEFINED(type) \
     (((type) & PSA_KEY_TYPE_VENDOR_FLAG) != 0)
-#define PSA_KEY_TYPE_IS_RAW_BYTES(type)                                 \
-    (((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_RAW_DATA ||  \
-     ((type) & PSA_KEY_TYPE_CATEGORY_MASK) == PSA_KEY_TYPE_CATEGORY_SYMMETRIC)
 
 /** Whether a key type is asymmetric: either a key pair or a public key. */
 #define PSA_KEY_TYPE_IS_ASYMMETRIC(type)                                \
diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index a610af3..fc73b2c 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -116,6 +116,13 @@
     } data;
 } key_slot_t;
 
+static int key_type_is_raw_bytes( psa_key_type_t type )
+{
+    psa_key_type_t category = type & PSA_KEY_TYPE_CATEGORY_MASK;
+    return( category == PSA_KEY_TYPE_RAW_DATA ||
+            category == PSA_KEY_TYPE_CATEGORY_SYMMETRIC );
+}
+
 typedef struct
 {
     int initialized;
@@ -459,7 +466,7 @@
     if( slot->type != PSA_KEY_TYPE_NONE )
         return( PSA_ERROR_OCCUPIED_SLOT );
 
-    if( PSA_KEY_TYPE_IS_RAW_BYTES( type ) )
+    if( key_type_is_raw_bytes( type ) )
     {
         psa_status_t status;
         /* Ensure that a bytes-to-bit conversion won't overflow. */
@@ -541,7 +548,7 @@
         /* No key material to clean, but do zeroize the slot below to wipe
          * metadata such as policies. */
     }
-    else if( PSA_KEY_TYPE_IS_RAW_BYTES( slot->type ) )
+    else if( key_type_is_raw_bytes( slot->type ) )
     {
         mbedtls_free( slot->data.raw.data );
     }
@@ -589,7 +596,7 @@
     if( slot->type == PSA_KEY_TYPE_NONE )
         return( PSA_ERROR_EMPTY_SLOT );
 
-    if( PSA_KEY_TYPE_IS_RAW_BYTES( slot->type ) )
+    if( key_type_is_raw_bytes( slot->type ) )
     {
         if( bits != NULL )
             *bits = slot->data.raw.bytes * 8;
@@ -643,7 +650,7 @@
         ( slot->policy.usage & PSA_KEY_USAGE_EXPORT ) == 0 )
         return( PSA_ERROR_NOT_PERMITTED );
 
-    if( PSA_KEY_TYPE_IS_RAW_BYTES( slot->type ) )
+    if( key_type_is_raw_bytes( slot->type ) )
     {
         if( slot->data.raw.bytes > data_size )
             return( PSA_ERROR_BUFFER_TOO_SMALL );
@@ -2632,7 +2639,7 @@
     if( parameters == NULL && parameters_size != 0 )
         return( PSA_ERROR_INVALID_ARGUMENT );
 
-    if( PSA_KEY_TYPE_IS_RAW_BYTES( type ) )
+    if( key_type_is_raw_bytes( type ) )
     {
         psa_status_t status = prepare_raw_data_slot( type, bits,
                                                      &slot->data.raw );
diff --git a/tests/suites/test_suite_psa_crypto.function b/tests/suites/test_suite_psa_crypto.function
index 9af19fa..2d279fc 100644
--- a/tests/suites/test_suite_psa_crypto.function
+++ b/tests/suites/test_suite_psa_crypto.function
@@ -27,6 +27,13 @@
     return( 1 );
 }
 
+static int key_type_is_raw_bytes( psa_key_type_t type )
+{
+    psa_key_type_t category = type & PSA_KEY_TYPE_CATEGORY_MASK;
+    return( category == PSA_KEY_TYPE_RAW_DATA ||
+            category == PSA_KEY_TYPE_CATEGORY_SYMMETRIC );
+}
+
 static int exercise_mac_key( psa_key_slot_t key,
                              psa_key_usage_t usage,
                              psa_algorithm_t alg )
@@ -1967,7 +1974,7 @@
                                  &exported_length ) == expected_export_status );
     if( expected_export_status == PSA_SUCCESS )
     {
-        if( PSA_KEY_TYPE_IS_RAW_BYTES( type ) )
+        if( key_type_is_raw_bytes( type ) )
             TEST_ASSERT( exported_length == ( bits + 7 ) / 8 );
 #if defined(MBEDTLS_DES_C)
         if( type == PSA_KEY_TYPE_DES )