diff --git a/src/constant.rs b/src/constant.rs
index b9d4bc9ff29..a60964f0f75 100644
--- a/src/constant.rs
+++ b/src/constant.rs
@@ -200,11 +200,15 @@ pub(crate) fn codegen_const_value<'tcx>(
                 CValue::by_val(val, layout)
             }
         },
-        ConstValue::ByRef { alloc, offset } => CValue::by_ref(
-            pointer_for_allocation(fx, alloc)
-                .offset_i64(fx, i64::try_from(offset.bytes()).unwrap()),
-            layout,
-        ),
+        ConstValue::ByRef { alloc_id, offset } => {
+            let alloc = fx.tcx.global_alloc(alloc_id).unwrap_memory();
+            // FIXME: avoid creating multiple allocations for the same AllocId?
+            CValue::by_ref(
+                pointer_for_allocation(fx, alloc)
+                    .offset_i64(fx, i64::try_from(offset.bytes()).unwrap()),
+                layout,
+            )
+        }
         ConstValue::Slice { data, start, end } => {
             let ptr = pointer_for_allocation(fx, data)
                 .offset_i64(fx, i64::try_from(start).unwrap())
diff --git a/src/intrinsics/simd.rs b/src/intrinsics/simd.rs
index 9863e40b5b7..e17d587076f 100644
--- a/src/intrinsics/simd.rs
+++ b/src/intrinsics/simd.rs
@@ -172,7 +172,8 @@ pub(super) fn codegen_simd_intrinsic_call<'tcx>(
                     .expect("simd_shuffle idx not const");
 
                 let idx_bytes = match idx_const {
-                    ConstValue::ByRef { alloc, offset } => {
+                    ConstValue::ByRef { alloc_id, offset } => {
+                        let alloc = fx.tcx.global_alloc(alloc_id).unwrap_memory();
                         let size = Size::from_bytes(
                             4 * ret_lane_count, /* size_of([u32; ret_lane_count]) */
                         );