diff --git a/crates/compiler/gen_dev/src/lib.rs b/crates/compiler/gen_dev/src/lib.rs
index ef8425f454..b78788269e 100644
--- a/crates/compiler/gen_dev/src/lib.rs
+++ b/crates/compiler/gen_dev/src/lib.rs
@@ -1109,6 +1109,17 @@ trait Backend<'a> {
                 arg_layouts,
                 ret_layout,
             ),
+            LowLevel::NumToStr => {
+                let arg_layout = arg_layouts[0];
+                let intrinsic = match self.interner().get(arg_layout) {
+                    Layout::Builtin(Builtin::Int(width)) => &bitcode::STR_FROM_INT[width],
+                    Layout::Builtin(Builtin::Float(width)) => &bitcode::STR_FROM_FLOAT[width],
+                    Layout::Builtin(Builtin::Decimal) => bitcode::DEC_TO_STR,
+                    x => internal_error!("NumToStr is not defined for {:?}", x),
+                };
+
+                self.build_fn_call(sym, intrinsic.to_string(), args, arg_layouts, ret_layout)
+            }
             x => todo!("low level, {:?}", x),
         }
     }
diff --git a/crates/compiler/test_gen/src/gen_num.rs b/crates/compiler/test_gen/src/gen_num.rs
index 1eed3af00c..5704559f9a 100644
--- a/crates/compiler/test_gen/src/gen_num.rs
+++ b/crates/compiler/test_gen/src/gen_num.rs
@@ -3113,7 +3113,7 @@ fn when_on_i16() {
 }
 
 #[test]
-#[cfg(any(feature = "gen-llvm", feature = "gen-wasm"))]
+#[cfg(any(feature = "gen-llvm", feature = "gen-wasm", feature = "gen-dev"))]
 fn num_to_str() {
     use roc_std::RocStr;