diff --git a/include/ac/bytes.h b/include/ac/bytes.h
index 81b97d4200..609267997f 100644
--- a/include/ac/bytes.h
+++ b/include/ac/bytes.h
@@ -25,8 +25,7 @@
 #	elif SIZEOF_SHORT == 4
 #		define AC_INT4_TYPE short
 #	else
-/* used by SHA-1, but commented out */
-/* #	error "AC_INT2_TYPE?" */
+#	error "AC_INT4_TYPE?"
 #	endif
 #endif
 
@@ -42,8 +41,7 @@ typedef unsigned AC_INT4_TYPE ac_uint4;
 #	elif SIZEOF_LONG == 2
 #		define AC_INT2_TYPE long
 #	else
-/* not used, no error */
-/* #	error "AC_INT2_TYPE?" */
+#	error "AC_INT2_TYPE?"
 #	endif
 #endif