diff --git a/internal/shaderir/metal/metal.go b/internal/shaderir/metal/metal.go
index 9c06232ef..df92a138c 100644
--- a/internal/shaderir/metal/metal.go
+++ b/internal/shaderir/metal/metal.go
@@ -321,8 +321,8 @@ func (c *compileContext) metalBlock(p *shaderir.Program, topBlock, block *shader
 	var lines []string
 	for i, t := range block.LocalVars {
 		// The type is None e.g., when the variable is a for-loop counter.
-		name := localVariableName(p, topBlock, block.LocalVarIndexOffset+i)
 		if t.Main != shaderir.None {
+			name := localVariableName(p, topBlock, block.LocalVarIndexOffset+i)
 			lines = append(lines, fmt.Sprintf("%s%s = %s;", idt, c.metalVarDecl(p, &t, name, false, false), c.metalVarInit(p, &t)))
 		}
 	}