diff --git a/include/mbedtls/psa_util.h b/include/mbedtls/psa_util.h
index f18857c..691ff3c 100644
--- a/include/mbedtls/psa_util.h
+++ b/include/mbedtls/psa_util.h
@@ -92,8 +92,8 @@
         case MBEDTLS_MODE_CBC:
             if( taglen == 0 )
                 return( PSA_ALG_CBC_NO_PADDING );
-            /* Intentional fallthrough for taglen != 0 */
-            /* fallthrough */
+            else
+                return( 0 );
         default:
             return( 0 );
     }
@@ -151,7 +151,8 @@
     case MBEDTLS_MD_RIPEMD160:
         return( PSA_ALG_RIPEMD160 );
 #endif
-    case MBEDTLS_MD_NONE:  /* Intentional fallthrough */
+    case MBEDTLS_MD_NONE:
+        return( 0 );
     default:
         return( 0 );
     }