diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index 513bc5f..a8c15a0 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -85,6 +85,8 @@
 {
     switch( mode )
     {
+        case MBEDTLS_MODE_ECB:
+            return ( PSA_ALG_ECB_NO_PADDING );
         case MBEDTLS_MODE_GCM:
             return( PSA_ALG_AEAD_WITH_TAG_LENGTH( PSA_ALG_GCM, taglen ) );
         case MBEDTLS_MODE_CCM: