diff --git a/crates/wasmparser/src/validator/component_types.rs b/crates/wasmparser/src/validator/component_types.rs
index 17fc6ffb5d..e968fbcd40 100644
--- a/crates/wasmparser/src/validator/component_types.rs
+++ b/crates/wasmparser/src/validator/component_types.rs
@@ -1250,7 +1250,7 @@ impl ComponentFuncType {
                 // Function will have a single pointer parameter to pass the arguments
                 // via linear memory
                 sig.params.clear();
-                assert!(sig.params.try_push(ValType::I32));
+                assert!(sig.params.try_push(ptr_size.core_type()));
                 options.require_memory(offset)?;
 
                 // We need realloc as well when lifting a function
@@ -1281,10 +1281,10 @@ impl ComponentFuncType {
                         match abi {
                             Abi::Lower => {
                                 sig.params.max = MAX_LOWERED_TYPES;
-                                assert!(sig.params.try_push(ValType::I32));
+                                assert!(sig.params.try_push(ptr_size.core_type()));
                             }
                             Abi::Lift => {
-                                assert!(sig.results.try_push(ValType::I32));
+                                assert!(sig.results.try_push(ptr_size.core_type()));
                             }
                         }
                     }
diff --git a/tests/cli/component-model/memory64/list.wast b/tests/cli/component-model/memory64/list.wast
index 31e82e7371..1dd86f61c2 100644
--- a/tests/cli/component-model/memory64/list.wast
+++ b/tests/cli/component-model/memory64/list.wast
@@ -2,12 +2,12 @@
 
 (component
   (core module $m
-    (func (export "f") (param i64 i64))
+    (func (export "f") (param i64 i64) (result i64) unreachable)
     (func (export "realloc") (param i64 i64 i64 i64) (result i64) i64.const 0)
     (memory (export "memory") i64 1)
   )
   (core instance $m (instantiate $m))
-  (func (export "a") (param "a" (list u8))
+  (func (export "a") (param "a" (list u8)) (result (list u8))
     (canon lift (core func $m "f") (realloc (func $m "realloc")) (memory $m "memory"))
   )
 )
diff --git a/tests/cli/component-model/memory64/realloc.wast b/tests/cli/component-model/memory64/realloc.wast
index 12fc13d71c..04249e8a97 100644
--- a/tests/cli/component-model/memory64/realloc.wast
+++ b/tests/cli/component-model/memory64/realloc.wast
@@ -3,7 +3,7 @@
 (component
   (core module $m
     (memory (export "m") i64 1)
-    (func (export "f") (result i32) unreachable)
+    (func (export "f") (result i64) unreachable)
     (func (export "realloc") (param i64 i64 i64 i64) (result i64) unreachable)
   )
   (core instance $i (instantiate $m))
@@ -47,4 +47,4 @@
       )
     )
   )
-  "canonical option `realloc` uses a core function with an incorrect signature")
\ No newline at end of file
+  "canonical option `realloc` uses a core function with an incorrect signature")
diff --git a/tests/cli/component-model/memory64/string.wast b/tests/cli/component-model/memory64/string.wast
index c15071ed4f..12de7c8d9f 100644
--- a/tests/cli/component-model/memory64/string.wast
+++ b/tests/cli/component-model/memory64/string.wast
@@ -2,12 +2,12 @@
 
 (component
   (core module $m
-    (func (export "f") (param i64 i64))
+    (func (export "f") (param i64 i64) (result i64) unreachable)
     (func (export "realloc") (param i64 i64 i64 i64) (result i64) i64.const 0)
     (memory (export "memory") i64 1)
   )
   (core instance $m (instantiate $m))
-  (func (export "a") (param "a" string)
+  (func (export "a") (param "a" string) (result string)
     (canon lift (core func $m "f") (realloc (func $m "realloc")) (memory $m "memory"))
   )
 )
diff --git a/tests/snapshots/cli/component-model/memory64/list.wast/0.print b/tests/snapshots/cli/component-model/memory64/list.wast/0.print
index 109d46d167..6ea9aa40f0 100644
--- a/tests/snapshots/cli/component-model/memory64/list.wast/0.print
+++ b/tests/snapshots/cli/component-model/memory64/list.wast/0.print
@@ -1,22 +1,25 @@
 (component
   (core module $m (;0;)
-    (type (;0;) (func (param i64 i64)))
+    (type (;0;) (func (param i64 i64) (result i64)))
     (type (;1;) (func (param i64 i64 i64 i64) (result i64)))
     (memory (;0;) i64 1)
     (export "f" (func 0))
     (export "realloc" (func 1))
     (export "memory" (memory 0))
-    (func (;0;) (type 0) (param i64 i64))
+    (func (;0;) (type 0) (param i64 i64) (result i64)
+      unreachable
+    )
     (func (;1;) (type 1) (param i64 i64 i64 i64) (result i64)
       i64.const 0
     )
   )
   (core instance $m (;0;) (instantiate $m))
   (type (;0;) (list u8))
-  (type (;1;) (func (param "a" 0)))
+  (type (;1;) (list u8))
+  (type (;2;) (func (param "a" 0) (result 1)))
   (alias core export $m "f" (core func (;0;)))
   (alias core export $m "realloc" (core func (;1;)))
   (alias core export $m "memory" (core memory (;0;)))
-  (func (;0;) (type 1) (canon lift (core func 0) (realloc 1) (memory 0)))
+  (func (;0;) (type 2) (canon lift (core func 0) (realloc 1) (memory 0)))
   (export (;1;) "a" (func 0))
 )
diff --git a/tests/snapshots/cli/component-model/memory64/realloc.wast/0.print b/tests/snapshots/cli/component-model/memory64/realloc.wast/0.print
index 6b1f904c64..e2b67be934 100644
--- a/tests/snapshots/cli/component-model/memory64/realloc.wast/0.print
+++ b/tests/snapshots/cli/component-model/memory64/realloc.wast/0.print
@@ -1,12 +1,12 @@
 (component
   (core module $m (;0;)
-    (type (;0;) (func (result i32)))
+    (type (;0;) (func (result i64)))
     (type (;1;) (func (param i64 i64 i64 i64) (result i64)))
     (memory (;0;) i64 1)
     (export "m" (memory 0))
     (export "f" (func 0))
     (export "realloc" (func 1))
-    (func (;0;) (type 0) (result i32)
+    (func (;0;) (type 0) (result i64)
       unreachable
     )
     (func (;1;) (type 1) (param i64 i64 i64 i64) (result i64)
diff --git a/tests/snapshots/cli/component-model/memory64/string.wast/0.print b/tests/snapshots/cli/component-model/memory64/string.wast/0.print
index b0b211c567..9c412cf845 100644
--- a/tests/snapshots/cli/component-model/memory64/string.wast/0.print
+++ b/tests/snapshots/cli/component-model/memory64/string.wast/0.print
@@ -1,18 +1,20 @@
 (component
   (core module $m (;0;)
-    (type (;0;) (func (param i64 i64)))
+    (type (;0;) (func (param i64 i64) (result i64)))
     (type (;1;) (func (param i64 i64 i64 i64) (result i64)))
     (memory (;0;) i64 1)
     (export "f" (func 0))
     (export "realloc" (func 1))
     (export "memory" (memory 0))
-    (func (;0;) (type 0) (param i64 i64))
+    (func (;0;) (type 0) (param i64 i64) (result i64)
+      unreachable
+    )
     (func (;1;) (type 1) (param i64 i64 i64 i64) (result i64)
       i64.const 0
     )
   )
   (core instance $m (;0;) (instantiate $m))
-  (type (;0;) (func (param "a" string)))
+  (type (;0;) (func (param "a" string) (result string)))
   (alias core export $m "f" (core func (;0;)))
   (alias core export $m "realloc" (core func (;1;)))
   (alias core export $m "memory" (core memory (;0;)))