diff --git a/gcc/config/iq2000/iq2000.md b/gcc/config/iq2000/iq2000.md
index aaeda39ae99..f157a82ebc0 100644
--- a/gcc/config/iq2000/iq2000.md
+++ b/gcc/config/iq2000/iq2000.md
@@ -988,7 +988,7 @@
 (define_insn "rotrsi3"
   [(set (match_operand:SI 0 "register_operand" "=r")
         (rotatert:SI (match_operand:SI 1 "register_operand" "r")
-                     (match_operand:SI 2 "uns_arith_operand" "O")))]
+                     (match_operand:SI 2 "uns_arith_constant" "O")))]
   ""
   "ram %0,%1,%2,0x0,0x0"
   [(set_attr "type" "arith")])
diff --git a/gcc/config/iq2000/predicates.md b/gcc/config/iq2000/predicates.md
index 1330f7d613c..38857e17c24 100644
--- a/gcc/config/iq2000/predicates.md
+++ b/gcc/config/iq2000/predicates.md
@@ -17,6 +17,15 @@
 ;; along with GCC; see the file COPYING3.  If not see
 ;; <http://www.gnu.org/licenses/>.
 
+;; Return 1 if OP can be used as an operand where a 16-bit
+;; unsigned integer is needed.
+
+(define_predicate "uns_arith_constant"
+  (match_code "const_int")
+{
+  return SMALL_INT_UNSIGNED (op);
+})
+
 ;; Return 1 if OP can be used as an operand where a register or 16-bit
 ;; unsigned integer is needed.