diff --git a/macros/Cargo.toml b/macros/Cargo.toml
index 56bfd5cdc2..de860b1c94 100644
--- a/macros/Cargo.toml
+++ b/macros/Cargo.toml
@@ -22,4 +22,4 @@ proc-macro2 = "1"
 proc-macro-error = "1"
 quote = "1"
 syn = "1"
-rtic-syntax = "0.5.0-alpha.4"
+rtic-syntax = "0.5.0-rc.1"
diff --git a/macros/src/codegen/pre_init.rs b/macros/src/codegen/pre_init.rs
index 69f16fe376..eb216d8657 100644
--- a/macros/src/codegen/pre_init.rs
+++ b/macros/src/codegen/pre_init.rs
@@ -83,7 +83,11 @@ pub fn codegen(app: &App, analysis: &Analysis, extra: &Extra) -> Vec<TokenStream
 
     // Initialize monotonic's interrupts
     for (_, monotonic) in &app.monotonics {
-        let priority = &monotonic.args.priority;
+        let priority = if let Some(prio) = monotonic.args.priority {
+            quote! { #prio }
+        } else {
+            quote! { (1 << #nvic_prio_bits) }
+        };
         let binds = &monotonic.args.binds;
 
         // Compile time assert that this priority is supported by the device