diff --git a/newlib/libm/common/s_round.c b/newlib/libm/common/s_round.c
index 047574a84..e3a91d6c2 100644
--- a/newlib/libm/common/s_round.c
+++ b/newlib/libm/common/s_round.c
@@ -68,7 +68,7 @@ SEEALSO
           msw &= 0x80000000;
           if (exponent_less_1023 == -1)
             /* Result is +1.0 or -1.0. */
-            msw |= (1023 << 20);
+            msw |= ((__int32_t)1023 << 20);
           lsw = 0;
         }
       else