diff --git a/tests/include/test/drivers/key_management.h b/tests/include/test/drivers/key_management.h
index 7811fb4..9d51758 100644
--- a/tests/include/test/drivers/key_management.h
+++ b/tests/include/test/drivers/key_management.h
@@ -58,6 +58,11 @@
     const psa_key_attributes_t *attributes,
     uint8_t *key, size_t key_size, size_t *key_length );
 
+psa_status_t test_opaque_export_key(
+    const psa_key_attributes_t *attributes,
+    const uint8_t *key, size_t key_length,
+    uint8_t *data, size_t data_size, size_t *data_length );
+
 psa_status_t test_transparent_export_public_key(
     const psa_key_attributes_t *attributes,
     const uint8_t *key, size_t key_length,
diff --git a/tests/src/drivers/key_management.c b/tests/src/drivers/key_management.c
index ab3210b..76d2b3f 100644
--- a/tests/src/drivers/key_management.c
+++ b/tests/src/drivers/key_management.c
@@ -252,6 +252,19 @@
         * MBEDTLS_PSA_ACCEL_KEY_TYPE_ECC_PUBLIC_KEY */
 }
 
+psa_status_t test_opaque_export_key(
+    const psa_key_attributes_t *attributes,
+    const uint8_t *key, size_t key_length,
+    uint8_t *data, size_t data_size, size_t *data_length )
+{
+    (void) attributes;
+    (void) key;
+    (void) key_length;
+    (void) data;
+    (void) data_size;
+    (void) data_length;
+    return( PSA_ERROR_NOT_SUPPORTED );
+}
 psa_status_t test_transparent_export_public_key(
     const psa_key_attributes_t *attributes,
     const uint8_t *key, size_t key_length,