diff --git a/crates/mun_runtime/src/lib.rs b/crates/mun_runtime/src/lib.rs
index e1927ebe1..eb9bf5392 100644
--- a/crates/mun_runtime/src/lib.rs
+++ b/crates/mun_runtime/src/lib.rs
@@ -295,5 +295,5 @@ invoke_fn_impl! {
     fn invoke_fn12(a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, i: I, j: J, k: K, l: L) -> InvokeErr12;
     fn invoke_fn13(a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, i: I, j: J, k: K, l: L, m: M) -> InvokeErr13;
     fn invoke_fn14(a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, i: I, j: J, k: K, l: L, m: M, n: N) -> InvokeErr14;
-    fn invoke_fn15(a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, i: I, j: J, k: K, l: L, m: M, n: N, o:O) -> InvokeErr15;
+    fn invoke_fn15(a: A, b: B, c: C, d: D, e: E, f: F, g: G, h: H, i: I, j: J, k: K, l: L, m: M, n: N, o: O) -> InvokeErr15;
 }