diff --git a/compiler/rustc_ty_utils/src/ty.rs b/compiler/rustc_ty_utils/src/ty.rs
index ebc7b0d0d99..0373033bd28 100644
--- a/compiler/rustc_ty_utils/src/ty.rs
+++ b/compiler/rustc_ty_utils/src/ty.rs
@@ -402,7 +402,7 @@ fn instance_def_size_estimate<'tcx>(
     match instance_def {
         InstanceDef::Item(..) | InstanceDef::DropGlue(..) => {
             let mir = tcx.instance_mir(instance_def);
-            mir.basic_blocks().iter().map(|bb| bb.statements.len()).sum()
+            mir.basic_blocks().iter().map(|bb| bb.statements.len() + 1).sum()
         }
         // Estimate the size of other compiler-generated shims to be 1.
         _ => 1,