diff --git a/library/pk_wrap.h b/library/pk_wrap.h
index 7375da1..1b490cc 100644
--- a/library/pk_wrap.h
+++ b/library/pk_wrap.h
@@ -142,7 +142,7 @@
 int mbedtls_pk_error_from_psa_ecdsa( psa_status_t status );
 #endif
 
-#endif
+#endif /* MBEDTLS_USE_PSA_CRYPTO */
 
 #if defined(MBEDTLS_PSA_CRYPTO_C)
 int mbedtls_pk_error_from_psa( psa_status_t status );