diff --git a/compiler/mono/src/ir.rs b/compiler/mono/src/ir.rs
index 3a5c368d04..1a8f93f6b5 100644
--- a/compiler/mono/src/ir.rs
+++ b/compiler/mono/src/ir.rs
@@ -1632,16 +1632,19 @@ impl<'a> Stmt<'a> {
         use Stmt::*;
 
         match self {
-            Let(symbol, expr, _layout, cont) => alloc
-                .text("let ")
-                .append(symbol_to_doc(alloc, *symbol))
-                //.append(" : ")
-                //.append(alloc.text(format!("{:?}", _layout)))
-                .append(" = ")
-                .append(expr.to_doc(alloc))
-                .append(";")
-                .append(alloc.hardline())
-                .append(cont.to_doc(alloc)),
+            Let(symbol, expr, layout, cont) => {
+                let mut doc = alloc.text("let ").append(symbol_to_doc(alloc, *symbol));
+                if PRETTY_PRINT_IR_SYMBOLS {
+                    doc = doc
+                        .append(" : ")
+                        .append(alloc.text(format!("{:?}", layout)));
+                }
+                doc.append(" = ")
+                    .append(expr.to_doc(alloc))
+                    .append(";")
+                    .append(alloc.hardline())
+                    .append(cont.to_doc(alloc))
+            }
 
             Refcounting(modify, cont) => modify
                 .to_doc(alloc)