diff --git a/wasmtime-api/src/instance.rs b/wasmtime-api/src/instance.rs
index 214f30e2aa..df76133191 100644
--- a/wasmtime-api/src/instance.rs
+++ b/wasmtime-api/src/instance.rs
@@ -112,7 +112,6 @@ impl Instance {
                 // HACK ensure all handles, instantiated outside Store, present in
                 // the store's SignatureRegistry, e.g. WASI instances that are
                 // imported into this store using the from_handle() method.
-                use crate::runtime::SignatureRegistry;
                 let _ = store.borrow_mut().register_cranelift_signature(signature);
             }
             export_names_map.insert(name.to_owned(), exports.len());
diff --git a/wasmtime-api/src/runtime.rs b/wasmtime-api/src/runtime.rs
index 4d136e9083..f00481c411 100644
--- a/wasmtime-api/src/runtime.rs
+++ b/wasmtime-api/src/runtime.rs
@@ -79,20 +79,6 @@ impl Engine {
 
 // Store
 
-/// The SignatureRegistry allow register new cranelift signature,
-/// and also quickly retrive the signature back using registration
-/// index.
-pub(crate) trait SignatureRegistry {
-    fn register_cranelift_signature(
-        &mut self,
-        signature: &ir::Signature,
-    ) -> wasmtime_runtime::VMSharedSignatureIndex;
-    fn lookup_cranelift_signature(
-        &self,
-        type_index: wasmtime_runtime::VMSharedSignatureIndex,
-    ) -> Option<&ir::Signature>;
-}
-
 pub struct Store {
     engine: Rc<RefCell<Engine>>,
     context: Context,
@@ -127,10 +113,8 @@ impl Store {
     ) -> &Rc<RefCell<HashMap<String, Option<wasmtime_runtime::Export>>>> {
         &self.global_exports
     }
-}
 
-impl SignatureRegistry for Store {
-    fn register_cranelift_signature(
+    pub(crate) fn register_cranelift_signature(
         &mut self,
         signature: &ir::Signature,
     ) -> wasmtime_runtime::VMSharedSignatureIndex {
@@ -144,7 +128,8 @@ impl SignatureRegistry for Store {
         }
         index
     }
-    fn lookup_cranelift_signature(
+
+    pub(crate) fn lookup_cranelift_signature(
         &self,
         type_index: wasmtime_runtime::VMSharedSignatureIndex,
     ) -> Option<&ir::Signature> {
diff --git a/wasmtime-api/src/trampoline/create_handle.rs b/wasmtime-api/src/trampoline/create_handle.rs
index af7aa35545..f765eed993 100644
--- a/wasmtime-api/src/trampoline/create_handle.rs
+++ b/wasmtime-api/src/trampoline/create_handle.rs
@@ -12,11 +12,11 @@ use std::cell::{RefCell, RefMut};
 use std::collections::{HashMap, HashSet};
 use std::rc::Rc;
 
-use crate::runtime::SignatureRegistry;
+use crate::runtime::Store;
 
 pub(crate) fn create_handle(
     module: Module,
-    signature_registry: Option<RefMut<dyn SignatureRegistry>>,
+    signature_registry: Option<RefMut<Store>>,
     finished_functions: PrimaryMap<DefinedFuncIndex, *const VMFunctionBody>,
     state: Box<dyn Any>,
 ) -> Result<InstanceHandle, Error> {
diff --git a/wasmtime-api/src/values.rs b/wasmtime-api/src/values.rs
index 677963a85d..f8b1430f13 100644
--- a/wasmtime-api/src/values.rs
+++ b/wasmtime-api/src/values.rs
@@ -1,5 +1,5 @@
 use crate::callable::{WasmtimeFn, WrappedCallable};
-use crate::runtime::{SignatureRegistry, Store};
+use crate::runtime::Store;
 use crate::types::ValType;
 use std::any::Any;
 use std::cell::RefCell;