diff --git a/lib/wasm/src/runtime/dummy.rs b/lib/wasm/src/runtime/dummy.rs
index b6d849d751..de630d8810 100644
--- a/lib/wasm/src/runtime/dummy.rs
+++ b/lib/wasm/src/runtime/dummy.rs
@@ -47,7 +47,7 @@ impl FuncEnvironment for DummyRuntime {
         &self.flags
     }
 
-    fn make_global(&self, func: &mut ir::Function, index: GlobalIndex) -> GlobalValue {
+    fn make_global(&mut self, func: &mut ir::Function, index: GlobalIndex) -> GlobalValue {
         // Just create a dummy `vmctx` global.
         let offset = ((index * 8) as i32 + 8).into();
         let gv = func.create_global_var(ir::GlobalVarData::VmCtx { offset });
@@ -57,7 +57,7 @@ impl FuncEnvironment for DummyRuntime {
         }
     }
 
-    fn make_heap(&self, func: &mut ir::Function, _index: MemoryIndex) -> ir::Heap {
+    fn make_heap(&mut self, func: &mut ir::Function, _index: MemoryIndex) -> ir::Heap {
         func.create_heap(ir::HeapData {
             base: ir::HeapBase::ReservedReg,
             min_size: 0.into(),
@@ -66,13 +66,13 @@ impl FuncEnvironment for DummyRuntime {
         })
     }
 
-    fn make_indirect_sig(&self, func: &mut ir::Function, index: SignatureIndex) -> ir::SigRef {
+    fn make_indirect_sig(&mut self, func: &mut ir::Function, index: SignatureIndex) -> ir::SigRef {
         // A real implementation would probably change the calling convention and add `vmctx` and
         // signature index arguments.
         func.import_signature(self.signatures[index].clone())
     }
 
-    fn make_direct_func(&self, func: &mut ir::Function, index: FunctionIndex) -> ir::FuncRef {
+    fn make_direct_func(&mut self, func: &mut ir::Function, index: FunctionIndex) -> ir::FuncRef {
         let sigidx = self.func_types[index];
         // A real implementation would probably add a `vmctx` argument.
         // And maybe attempt some signature de-duplication.
@@ -87,7 +87,7 @@ impl FuncEnvironment for DummyRuntime {
     }
 
     fn translate_call_indirect(
-        &self,
+        &mut self,
         mut pos: FuncCursor,
         _table_index: TableIndex,
         _sig_index: SignatureIndex,
@@ -99,7 +99,7 @@ impl FuncEnvironment for DummyRuntime {
     }
 
     fn translate_grow_memory(
-        &self,
+        &mut self,
         mut pos: FuncCursor,
         _index: MemoryIndex,
         _heap: ir::Heap,
@@ -109,7 +109,7 @@ impl FuncEnvironment for DummyRuntime {
     }
 
     fn translate_current_memory(
-        &self,
+        &mut self,
         mut pos: FuncCursor,
         _index: MemoryIndex,
         _heap: ir::Heap,
diff --git a/lib/wasm/src/runtime/spec.rs b/lib/wasm/src/runtime/spec.rs
index cdd3b69920..503e5079ef 100644
--- a/lib/wasm/src/runtime/spec.rs
+++ b/lib/wasm/src/runtime/spec.rs
@@ -48,13 +48,13 @@ pub trait FuncEnvironment {
     ///
     /// Return the global variable reference that should be used to access the global and the
     /// WebAssembly type of the global.
-    fn make_global(&self, func: &mut ir::Function, index: GlobalIndex) -> GlobalValue;
+    fn make_global(&mut self, func: &mut ir::Function, index: GlobalIndex) -> GlobalValue;
 
     /// Set up the necessary preamble definitions in `func` to access the linear memory identified
     /// by `index`.
     ///
     /// The index space covers both imported and locally declared memories.
-    fn make_heap(&self, func: &mut ir::Function, index: MemoryIndex) -> ir::Heap;
+    fn make_heap(&mut self, func: &mut ir::Function, index: MemoryIndex) -> ir::Heap;
 
     /// Set up a signature definition in the preamble of `func` that can be used for an indirect
     /// call with signature `index`.
@@ -65,7 +65,7 @@ pub trait FuncEnvironment {
     ///
     /// The signature will only be used for indirect calls, even if the module has direct function
     /// calls with the same WebAssembly type.
-    fn make_indirect_sig(&self, func: &mut ir::Function, index: SignatureIndex) -> ir::SigRef;
+    fn make_indirect_sig(&mut self, func: &mut ir::Function, index: SignatureIndex) -> ir::SigRef;
 
     /// Set up an external function definition in the preamble of `func` that can be used to
     /// directly call the function `index`.
@@ -78,7 +78,7 @@ pub trait FuncEnvironment {
     ///
     /// The function's signature will only be used for direct calls, even if the module has
     /// indirect calls with the same WebAssembly type.
-    fn make_direct_func(&self, func: &mut ir::Function, index: FunctionIndex) -> ir::FuncRef;
+    fn make_direct_func(&mut self, func: &mut ir::Function, index: FunctionIndex) -> ir::FuncRef;
 
     /// Translate a `call_indirect` WebAssembly instruction at `pos`.
     ///
@@ -90,7 +90,7 @@ pub trait FuncEnvironment {
     ///
     /// Return the call instruction whose results are the WebAssembly return values.
     fn translate_call_indirect(
-        &self,
+        &mut self,
         pos: FuncCursor,
         table_index: TableIndex,
         sig_index: SignatureIndex,
@@ -107,7 +107,7 @@ pub trait FuncEnvironment {
     ///
     /// Return the call instruction whose results are the WebAssembly return values.
     fn translate_call(
-        &self,
+        &mut self,
         mut pos: FuncCursor,
         _callee_index: FunctionIndex,
         callee: ir::FuncRef,
@@ -125,7 +125,7 @@ pub trait FuncEnvironment {
     ///
     /// Returns the old size (in pages) of the memory.
     fn translate_grow_memory(
-        &self,
+        &mut self,
         pos: FuncCursor,
         index: MemoryIndex,
         heap: ir::Heap,
@@ -139,7 +139,7 @@ pub trait FuncEnvironment {
     ///
     /// Returns the size in pages of the memory.
     fn translate_current_memory(
-        &self,
+        &mut self,
         pos: FuncCursor,
         index: MemoryIndex,
         heap: ir::Heap,
diff --git a/lib/wasm/src/state.rs b/lib/wasm/src/state.rs
index cfe06e081a..8130b469af 100644
--- a/lib/wasm/src/state.rs
+++ b/lib/wasm/src/state.rs
@@ -266,7 +266,7 @@ impl TranslationState {
         &mut self,
         func: &mut ir::Function,
         index: u32,
-        environ: &FE,
+        environ: &mut FE,
     ) -> GlobalValue {
         let index = index as GlobalIndex;
         *self.globals.entry(index).or_insert_with(
@@ -280,7 +280,7 @@ impl TranslationState {
         &mut self,
         func: &mut ir::Function,
         index: u32,
-        environ: &FE,
+        environ: &mut FE,
     ) -> ir::Heap {
         let index = index as MemoryIndex;
         *self.heaps.entry(index).or_insert_with(
@@ -296,7 +296,7 @@ impl TranslationState {
         &mut self,
         func: &mut ir::Function,
         index: u32,
-        environ: &FE,
+        environ: &mut FE,
     ) -> (ir::SigRef, usize) {
         let index = index as SignatureIndex;
         *self.signatures.entry(index).or_insert_with(|| {
@@ -313,7 +313,7 @@ impl TranslationState {
         &mut self,
         func: &mut ir::Function,
         index: u32,
-        environ: &FE,
+        environ: &mut FE,
     ) -> (ir::FuncRef, usize) {
         let index = index as FunctionIndex;
         *self.functions.entry(index).or_insert_with(|| {