diff --git a/src/machine.rs b/src/machine.rs
index 37253a260de7..502120d316b7 100644
--- a/src/machine.rs
+++ b/src/machine.rs
@@ -182,6 +182,7 @@ fn enforce_validity(ecx: &InterpCx<'mir, 'tcx, Self>) -> bool {
     #[inline(always)]
     fn find_mir_or_eval_fn(
         ecx: &mut InterpCx<'mir, 'tcx, Self>,
+        _span: Span,
         instance: ty::Instance<'tcx>,
         args: &[OpTy<'tcx, Tag>],
         ret: Option<(PlaceTy<'tcx, Tag>, mir::BasicBlock)>,
diff --git a/src/shims/panic.rs b/src/shims/panic.rs
index f242f41f6f96..8f082f45c915 100644
--- a/src/shims/panic.rs
+++ b/src/shims/panic.rs
@@ -187,15 +187,12 @@ fn assert_panic(
                 let msg = msg.description();
                 let msg = this.allocate_str(msg, MiriMemoryKind::Env.into());
 
-                // Second arg: Caller location.
-                let location = this.alloc_caller_location_for_span(span);
-
                 // Call the lang item.
                 let panic = this.tcx.lang_items().panic_fn().unwrap();
                 let panic = ty::Instance::mono(this.tcx.tcx, panic);
                 this.call_function(
                     panic,
-                    &[msg.to_ref(), location.ptr.into()],
+                    &[msg.to_ref()],
                     None,
                     StackPopCleanup::Goto { ret: None, unwind },
                 )?;