diff --git a/src/back/msl/writer.rs b/src/back/msl/writer.rs
index ee5b9522ce..2964a92449 100644
--- a/src/back/msl/writer.rs
+++ b/src/back/msl/writer.rs
@@ -1189,17 +1189,13 @@ impl<W: Write> Writer<W> {
                 crate::ConstantInner::Composite { ty, ref components } => {
                     let name = &self.names[&NameKey::Constant(handle)];
                     let ty_name = &self.names[&NameKey::Type(ty)];
-                    write!(
-                        self.out,
-                        "constexpr constant {} {} = {}(",
-                        ty_name, name, ty_name
-                    )?;
+                    write!(self.out, "constexpr constant {} {} = {{", ty_name, name,)?;
                     for (i, &sub_handle) in components.iter().enumerate() {
                         let separator = if i != 0 { ", " } else { "" };
                         let sub_name = &self.names[&NameKey::Constant(sub_handle)];
                         write!(self.out, "{}{}", separator, sub_name)?;
                     }
-                    writeln!(self.out, ");")?;
+                    writeln!(self.out, "}};")?;
                 }
             }
         }
diff --git a/tests/out/shadow.msl.snap b/tests/out/shadow.msl.snap
index 906e53bfd0..c03bf1cdaf 100644
--- a/tests/out/shadow.msl.snap
+++ b/tests/out/shadow.msl.snap
@@ -34,7 +34,7 @@ typedef uint type6;
 typedef float type7;
 typedef metal::float2 type8;
 typedef metal::float3 type9;
-constexpr constant type9 c_ambient = type9(const_0_05f, const_0_05f, const_0_05f);
+constexpr constant type9 c_ambient = {const_0_05f, const_0_05f, const_0_05f};
 type7 fetch_shadow(
     type6 light_id,
     type2 homogeneous_coords,