diff --git a/library/psa_crypto.c b/library/psa_crypto.c
index 7f18bd4..76d7420 100644
--- a/library/psa_crypto.c
+++ b/library/psa_crypto.c
@@ -511,7 +511,7 @@
                 ret = mbedtls_pk_write_key_der( &pk, data, data_size );
             else
                 ret = mbedtls_pk_write_pubkey_der( &pk, data, data_size );
-            if ( ret < 0 )
+            if( ret < 0 )
                 return( mbedtls_to_psa_error( ret ) );
             *data_length = ret;
             return( PSA_SUCCESS );