diff -Nurp binutils-2.26.1-orig/gas/config/tc-s390.c binutils-2.26.1/gas/config/tc-s390.c
--- binutils-2.26.1-orig/gas/config/tc-s390.c	2018-07-04 09:55:49.522015395 +0200
+++ binutils-2.26.1/gas/config/tc-s390.c	2018-07-04 09:56:06.642098477 +0200
@@ -321,6 +321,9 @@ s390_parse_cpu (char *         arg,
 	}
     }
 
+  if (icpu == S390_OPCODE_MAXCPU)
+    return S390_OPCODE_MAXCPU;
+
   ilp_bak = input_line_pointer;
   if (icpu != S390_OPCODE_MAXCPU)
     {