diff --git a/src/desc/query/generic.rs b/src/desc/query/generic.rs
index 10ca6f6..d3abd80 100644
--- a/src/desc/query/generic.rs
+++ b/src/desc/query/generic.rs
@@ -43,7 +43,7 @@ impl<Querier: ReuseAdvice + ?Sized> ReuseAdvice for &mut Querier {
     type ShouldReuse = Querier::ShouldReuse;
 }
 
-impl<Ptr: Deref<Target: ReuseAdvice + ?Sized>> ReuseAdvice for Pin<Ptr> {
+impl<Ptr: Deref<Target: ReuseAdvice>> ReuseAdvice for Pin<Ptr> {
     type ShouldReuse = <Ptr::Target as ReuseAdvice>::ShouldReuse;
 }
 
diff --git a/src/srcinfo/query/generic.rs b/src/srcinfo/query/generic.rs
index 5ebc12c..b5306a1 100644
--- a/src/srcinfo/query/generic.rs
+++ b/src/srcinfo/query/generic.rs
@@ -52,7 +52,7 @@ impl<Querier: ReuseAdvice + ?Sized> ReuseAdvice for &mut Querier {
     type ShouldReuse = Querier::ShouldReuse;
 }
 
-impl<Ptr: Deref<Target: ReuseAdvice + ?Sized>> ReuseAdvice for Pin<Ptr> {
+impl<Ptr: Deref<Target: ReuseAdvice>> ReuseAdvice for Pin<Ptr> {
     type ShouldReuse = <Ptr::Target as ReuseAdvice>::ShouldReuse;
 }