diff --git a/crates/grain/src/lib.rs b/crates/grain/src/lib.rs
index 532f8c7cb..24af8f034 100644
--- a/crates/grain/src/lib.rs
+++ b/crates/grain/src/lib.rs
@@ -2492,7 +2492,10 @@ impl Bindgen for FunctionBindgen<'_, '_> {
 
                 self.push_str("for (let mut i = WasmI32.(-)(");
                 self.push_str(&len);
-                self.push_str(", 1n); WasmI32.gtU(i, 0n); i = WasmI32.(-)(i, 1n)) {\n");
+                // We loop from the end of the list to the start,
+                // because wasm is unsigned when we hit `0` we'll loop back around to `-1`
+                // and exit the loop.
+                self.push_str(", 1n); WasmI32.(!=)(i, -1n); i = WasmI32.(-)(i, 1n)) {\n");
                 self.push_str("let base = WasmI32.(+)(");
                 self.push_str(&base);
                 self.push_str(", WasmI32.(*)(i, ");