diff --git a/src/testing/inject.rs b/src/testing/inject.rs
index 4ba9a88..2514762 100644
--- a/src/testing/inject.rs
+++ b/src/testing/inject.rs
@@ -4,7 +4,7 @@ use crate::func::context::*;
 use crate::rcore::*;
 
 trait Inject<'a, Ctx: Context<'a>>: 'a {
-    fn inject<A: 'a>(fa: Wrapped<'a, Ctx, A>) -> Wrapped<'a, Ctx, A>;
+    fn inject<A: 'a>(&self, fa: Wrapped<'a, Ctx, A>) -> Wrapped<'a, Ctx, A>;
 }
 
 struct InjectedResolver<'a, Ctx: Context<'a>, F: Inject<'a, Ctx>> {
@@ -16,7 +16,7 @@ impl<'a, Ctx: Context<'a>, F: Inject<'a, Ctx>> Resolver<'a, Ctx> for InjectedRes
     fn resolve(self: Rc<Self>, address: crate::rcore::Address) -> HashResolution<'a, Ctx> {
         let inject = self.inject.clone();
         Ctx::fmap(
-            self.resolver.clone().resolve(address),
+            self.inject.inject(self.resolver.clone().resolve(address)),
             |resolved| match resolved {
                 Ok((source, resolver)) => Ok((
                     source,