diff --git a/failing-ui-tests.txt b/failing-ui-tests.txt
index 5b3166113e7..6182353599b 100644
--- a/failing-ui-tests.txt
+++ b/failing-ui-tests.txt
@@ -31,7 +31,6 @@ src/test/ui/sepcomp/sepcomp-fns-backwards.rs
 src/test/ui/sepcomp/sepcomp-fns.rs
 src/test/ui/sepcomp/sepcomp-statics.rs
 src/test/ui/simd/intrinsic/generic-arithmetic-pass.rs
-src/test/ui/simd/intrinsic/generic-bitmask-pass.rs
 src/test/ui/simd/intrinsic/generic-gather-pass.rs
 src/test/ui/simd/issue-17170.rs
 src/test/ui/simd/issue-39720.rs
diff --git a/src/intrinsic/simd.rs b/src/intrinsic/simd.rs
index fbfcebe46a1..a4f35c061f0 100644
--- a/src/intrinsic/simd.rs
+++ b/src/intrinsic/simd.rs
@@ -351,7 +351,7 @@ macro_rules! arith_binary {
         let mut result = bx.context.new_rvalue_zero(result_type);
 
         let elem_size = elem_type.get_size() * 8;
-        let sign_shift = bx.context.new_rvalue_from_int(elem_type, elem_size as i32);
+        let sign_shift = bx.context.new_rvalue_from_int(elem_type, elem_size as i32 - 1);
         let one = bx.context.new_rvalue_one(elem_type);
 
         let mut shift = 0;