diff --git a/src/writer/msl/generator_impl.cc b/src/writer/msl/generator_impl.cc
index 193e4e7d47..e569945497 100644
--- a/src/writer/msl/generator_impl.cc
+++ b/src/writer/msl/generator_impl.cc
@@ -1311,7 +1311,9 @@ bool GeneratorImpl::EmitFunctionInternal(ast::Function* func,
 
     auto* type = program_->Sem().Get(v)->Type();
 
-    if (!EmitType(type, program_->Symbols().NameFor(v->symbol()))) {
+    std::string param_name =
+        "const " + program_->Symbols().NameFor(v->symbol());
+    if (!EmitType(type, param_name)) {
       return false;
     }
     // Parameter name is output as part of the type for arrays and pointers.
diff --git a/src/writer/msl/generator_impl_function_test.cc b/src/writer/msl/generator_impl_function_test.cc
index 5cf1eb85d8..8ec73fb222 100644
--- a/src/writer/msl/generator_impl_function_test.cc
+++ b/src/writer/msl/generator_impl_function_test.cc
@@ -770,7 +770,7 @@ TEST_F(MslGeneratorImplTest, Emit_Function_WithArrayParams) {
   EXPECT_EQ(gen.result(), R"(#include <metal_stdlib>
 
 using namespace metal;
-  void my_func(float a[5]) {
+  void my_func(float const a[5]) {
     return;
   }
 
diff --git a/test/ptr_ref/load/param/ptr.spvasm.expected.msl b/test/ptr_ref/load/param/ptr.spvasm.expected.msl
index cf1067f7c1..19998585a0 100644
--- a/test/ptr_ref/load/param/ptr.spvasm.expected.msl
+++ b/test/ptr_ref/load/param/ptr.spvasm.expected.msl
@@ -1,7 +1,7 @@
 #include <metal_stdlib>
 
 using namespace metal;
-int func(int value, thread int* pointer) {
+int func(int value, thread int* const pointer) {
   int const x_9 = *(pointer);
   return (value + x_9);
 }
diff --git a/test/ptr_ref/load/param/ptr.wgsl.expected.msl b/test/ptr_ref/load/param/ptr.wgsl.expected.msl
index 20a0cc99c0..a2154743c9 100644
--- a/test/ptr_ref/load/param/ptr.wgsl.expected.msl
+++ b/test/ptr_ref/load/param/ptr.wgsl.expected.msl
@@ -1,7 +1,7 @@
 #include <metal_stdlib>
 
 using namespace metal;
-int func(int value, thread int* pointer) {
+int func(int value, thread int* const pointer) {
   return (value + *(pointer));
 }
 
diff --git a/test/ptr_ref/store/param/ptr.spvasm.expected.msl b/test/ptr_ref/store/param/ptr.spvasm.expected.msl
index 0633ba656c..98cc63cb88 100644
--- a/test/ptr_ref/store/param/ptr.spvasm.expected.msl
+++ b/test/ptr_ref/store/param/ptr.spvasm.expected.msl
@@ -1,7 +1,7 @@
 #include <metal_stdlib>
 
 using namespace metal;
-void func(int value, thread int* pointer) {
+void func(int value, thread int* const pointer) {
   *(pointer) = value;
   return;
 }
diff --git a/test/ptr_ref/store/param/ptr.wgsl.expected.msl b/test/ptr_ref/store/param/ptr.wgsl.expected.msl
index 9a64bcb243..7460a3e745 100644
--- a/test/ptr_ref/store/param/ptr.wgsl.expected.msl
+++ b/test/ptr_ref/store/param/ptr.wgsl.expected.msl
@@ -1,7 +1,7 @@
 #include <metal_stdlib>
 
 using namespace metal;
-void func(int value, thread int* pointer) {
+void func(int value, thread int* const pointer) {
   *(pointer) = value;
 }
 
diff --git a/test/types/parameters.wgsl.expected.msl b/test/types/parameters.wgsl.expected.msl
index 9134d86bf8..81ca7b35a3 100644
--- a/test/types/parameters.wgsl.expected.msl
+++ b/test/types/parameters.wgsl.expected.msl
@@ -4,7 +4,7 @@ using namespace metal;
 struct S {
 };
 
-void foo(bool param_bool, int param_i32, uint param_u32, float param_f32, int2 param_v2i32, uint3 param_v3u32, float4 param_v4f32, float2x3 param_m2x3, float param_arr[4], S param_struct, thread float* param_ptr_f32, thread float4* param_ptr_vec, thread float (*param_ptr_arr)[4]) {
+void foo(bool param_bool, int param_i32, uint param_u32, float param_f32, int2 param_v2i32, uint3 param_v3u32, float4 param_v4f32, float2x3 param_m2x3, float const param_arr[4], S param_struct, thread float* const param_ptr_f32, thread float4* const param_ptr_vec, thread float (*const param_ptr_arr)[4]) {
 }
 
 kernel void tint_symbol() {