diff --git a/src/back/msl/writer.rs b/src/back/msl/writer.rs
index 55c0d54822..3436ac0ec6 100644
--- a/src/back/msl/writer.rs
+++ b/src/back/msl/writer.rs
@@ -1207,10 +1207,10 @@ impl<W: Write> Writer<W> {
                     Mf::FindLsb => "",
                     Mf::FindMsb => "",
                     // data packing
-                    Mf::Pack4x8snorm => "pack_float_to_unorm4x8",
-                    Mf::Pack4x8unorm => "pack_float_to_snorm4x8",
-                    Mf::Pack2x16snorm => "pack_float_to_unorm2x16",
-                    Mf::Pack2x16unorm => "pack_float_to_snorm2x16",
+                    Mf::Pack4x8snorm => "pack_float_to_snorm4x8",
+                    Mf::Pack4x8unorm => "pack_float_to_unorm4x8",
+                    Mf::Pack2x16snorm => "pack_float_to_snorm2x16",
+                    Mf::Pack2x16unorm => "pack_float_to_unorm2x16",
                     Mf::Pack2x16float => "",
                     // data unpacking
                     Mf::Unpack4x8snorm => "unpack_snorm4x8_to_float",
diff --git a/tests/out/msl/bits.msl b/tests/out/msl/bits.msl
index b0c76ff82c..05574f7170 100644
--- a/tests/out/msl/bits.msl
+++ b/tests/out/msl/bits.msl
@@ -24,13 +24,13 @@ kernel void main_(
     f2_ = metal::float2(0.0);
     f4_ = metal::float4(0.0);
     metal::float4 _e28 = f4_;
-    u = metal::pack_float_to_unorm4x8(_e28);
+    u = metal::pack_float_to_snorm4x8(_e28);
     metal::float4 _e30 = f4_;
-    u = metal::pack_float_to_snorm4x8(_e30);
+    u = metal::pack_float_to_unorm4x8(_e30);
     metal::float2 _e32 = f2_;
-    u = metal::pack_float_to_unorm2x16(_e32);
+    u = metal::pack_float_to_snorm2x16(_e32);
     metal::float2 _e34 = f2_;
-    u = metal::pack_float_to_snorm2x16(_e34);
+    u = metal::pack_float_to_unorm2x16(_e34);
     metal::float2 _e36 = f2_;
     u = as_type<uint>(half2(_e36));
     metal::uint _e38 = u;