diff --git a/gas/ChangeLog b/gas/ChangeLog
index fece8b5941..b6bc2099cd 100644
--- a/gas/ChangeLog
+++ b/gas/ChangeLog
@@ -1,3 +1,7 @@
+2020-09-02  Alan Modra  <amodra@gmail.com>
+
+	* config/tc-nios2.c (md_apply_fix): Avoid too large shift.
+
 2020-09-02  Alan Modra  <amodra@gmail.com>
 
 	* config/tc-mips.c (load_register): Avoid too large shift.
diff --git a/gas/config/tc-nios2.c b/gas/config/tc-nios2.c
index 0134b15ae0..5f0033a9f0 100644
--- a/gas/config/tc-nios2.c
+++ b/gas/config/tc-nios2.c
@@ -1400,7 +1400,7 @@ md_apply_fix (fixS *fixP, valueT *valP, segT seg ATTRIBUTE_UNUSED)
 	      break;
 	    default:
 	      {
-		fixup &= ((valueT) 1 << howto->bitsize) - 1;
+		fixup &= ((valueT) 2 << (howto->bitsize - 1)) - 1;
 		break;
 	      }
 	    }