diff --git a/src/passes/Directize.cpp b/src/passes/Directize.cpp
index 78294d59d5b..66b42d3867f 100644
--- a/src/passes/Directize.cpp
+++ b/src/passes/Directize.cpp
@@ -130,7 +130,7 @@ struct FunctionDirectizer : public WalkerPass<PostWalker<FunctionDirectizer>> {
       return CallUtils::Unknown{};
     }
 
-    Index index = c->value.geti32();
+    Index index = c->value.getInteger();
 
     // Check if index is invalid, or the type is wrong.
     auto& flatTable = *table.flatTable;
diff --git a/src/passes/GenerateDynCalls.cpp b/src/passes/GenerateDynCalls.cpp
index 818bfa967ea..6e6e0a71781 100644
--- a/src/passes/GenerateDynCalls.cpp
+++ b/src/passes/GenerateDynCalls.cpp
@@ -140,8 +140,17 @@ void GenerateDynCalls::generateDynCallThunk(HeapType funcType) {
   }
   std::vector<NameType> namedParams;
   std::vector<Type> params;
-  namedParams.emplace_back("fptr", Type::i32); // function pointer param
-  params.push_back(Type::i32);
+  if (wasm->tables.empty()) {
+    // Add an imported table in exactly the same manner as the LLVM wasm backend
+    // would add one.
+    auto* table = wasm->addTable(Builder::makeTable(Name::fromInt(0)));
+    table->module = ENV;
+    table->base = "__indirect_function_table";
+    table->indexType = wasm->memories[0]->indexType;
+  }
+  auto& table = wasm->tables[0];
+  namedParams.emplace_back("fptr", table->indexType); // function pointer param
+  params.push_back(table->indexType);
   int p = 0;
   for (const auto& param : sig.params) {
     namedParams.emplace_back(std::to_string(p++), param);
@@ -150,21 +159,13 @@ void GenerateDynCalls::generateDynCallThunk(HeapType funcType) {
   auto f = builder.makeFunction(
     name, std::move(namedParams), Signature(Type(params), sig.results), {});
   f->hasExplicitName = true;
-  Expression* fptr = builder.makeLocalGet(0, Type::i32);
+  Expression* fptr = builder.makeLocalGet(0, table->indexType);
   std::vector<Expression*> args;
   Index i = 0;
   for (const auto& param : sig.params) {
     args.push_back(builder.makeLocalGet(++i, param));
   }
-  if (wasm->tables.empty()) {
-    // Add an imported table in exactly the same manner as the LLVM wasm backend
-    // would add one.
-    auto* table = wasm->addTable(Builder::makeTable(Name::fromInt(0)));
-    table->module = ENV;
-    table->base = "__indirect_function_table";
-  }
-  f->body =
-    builder.makeCallIndirect(wasm->tables[0]->name, fptr, args, funcType);
+  f->body = builder.makeCallIndirect(table->name, fptr, args, funcType);
 
   wasm->addFunction(std::move(f));
   exportFunction(*wasm, name, true);
diff --git a/test/lit/passes/directize-wasm64.wast b/test/lit/passes/directize-wasm64.wast
new file mode 100644
index 00000000000..8c3a0623f81
--- /dev/null
+++ b/test/lit/passes/directize-wasm64.wast
@@ -0,0 +1,37 @@
+;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.
+;; NOTE: This test was ported using port_passes_tests_to_lit.py and could be cleaned up.
+
+;; RUN: wasm-opt %s --directize --enable-memory64 -S -o - | filecheck %s
+
+(module
+ ;; CHECK:      (type $ii (func (param i32 i32)))
+ (type $ii (func (param i32 i32)))
+
+ ;; CHECK:      (table $0 i64 5 5 funcref)
+ (table $0 i64 5 5 funcref)
+
+ ;; CHECK:      (elem $elem (i64.const 1) $foo)
+ (elem $elem (i64.const 1) $foo)
+
+ ;; CHECK:      (func $foo (param $0 i32) (param $1 i32)
+ ;; CHECK-NEXT:  (unreachable)
+ ;; CHECK-NEXT: )
+ (func $foo (param i32) (param i32)
+  ;; helper function
+  (unreachable)
+ )
+
+ ;; CHECK:      (func $bar (param $x i32) (param $y i32)
+ ;; CHECK-NEXT:  (call $foo
+ ;; CHECK-NEXT:   (local.get $x)
+ ;; CHECK-NEXT:   (local.get $y)
+ ;; CHECK-NEXT:  )
+ ;; CHECK-NEXT: )
+ (func $bar (param $x i32) (param $y i32)
+  (call_indirect (type $ii)
+   (local.get $x)
+   (local.get $y)
+   (i64.const 1)
+  )
+ )
+)
diff --git a/test/lit/passes/generate-dyncalls-wasm64.wast b/test/lit/passes/generate-dyncalls-wasm64.wast
new file mode 100644
index 00000000000..c8dfba32e12
--- /dev/null
+++ b/test/lit/passes/generate-dyncalls-wasm64.wast
@@ -0,0 +1,48 @@
+;; NOTE: Assertions have been generated by update_lit_checks.py --all-items and should not be edited.
+;; RUN: wasm-opt %s --generate-dyncalls --enable-memory64 -S -o - | filecheck %s
+
+(module
+ ;; CHECK:      (type $0 (func (result i32)))
+
+ ;; CHECK:      (type $1 (func (param i32) (result i64)))
+
+ ;; CHECK:      (type $2 (func (param i64) (result i32)))
+
+ ;; CHECK:      (type $3 (func (param i64 i32) (result i64)))
+
+ ;; CHECK:      (memory $m i64 1)
+ (memory $m i64 1)
+ ;; CHECK:      (table $t i64 2 2 funcref)
+ (table $t i64 2 2 funcref)
+ ;; CHECK:      (elem $elem (i64.const 0) $f1 $f2)
+ (elem $elem (i64.const 0) $f1 $f2)
+
+ ;; CHECK:      (export "dynCall_i" (func $dynCall_i))
+
+ ;; CHECK:      (export "dynCall_ji" (func $dynCall_ji))
+
+ ;; CHECK:      (func $f1 (result i32)
+ ;; CHECK-NEXT:  (i32.const 1024)
+ ;; CHECK-NEXT: )
+ (func $f1 (result i32)
+  (i32.const 1024)
+ )
+ ;; CHECK:      (func $f2 (param $0 i32) (result i64)
+ ;; CHECK-NEXT:  (i64.const 42)
+ ;; CHECK-NEXT: )
+ (func $f2 (param i32) (result i64)
+  (i64.const 42)
+ )
+)
+;; CHECK:      (func $dynCall_i (param $fptr i64) (result i32)
+;; CHECK-NEXT:  (call_indirect (type $0)
+;; CHECK-NEXT:   (local.get $fptr)
+;; CHECK-NEXT:  )
+;; CHECK-NEXT: )
+
+;; CHECK:      (func $dynCall_ji (param $fptr i64) (param $0 i32) (result i64)
+;; CHECK-NEXT:  (call_indirect (type $1)
+;; CHECK-NEXT:   (local.get $0)
+;; CHECK-NEXT:   (local.get $fptr)
+;; CHECK-NEXT:  )
+;; CHECK-NEXT: )