diff --git a/crates/proc-macro-srv/src/server.rs b/crates/proc-macro-srv/src/server.rs
index af50e1b70d..ed9d770505 100644
--- a/crates/proc-macro-srv/src/server.rs
+++ b/crates/proc-macro-srv/src/server.rs
@@ -78,8 +78,8 @@ fn literal_to_external(literal_kind: ast::LiteralKind) -> Option<proc_macro::bri
                 bridge::LitKind::CStr
             }
         }
-        ast::LiteralKind::IntNumber(num) => bridge::LitKind::Integer,
-        ast::LiteralKind::FloatNumber(num) => bridge::LitKind::Float,
+        ast::LiteralKind::IntNumber(_) => bridge::LitKind::Integer,
+        ast::LiteralKind::FloatNumber(_) => bridge::LitKind::Float,
         ast::LiteralKind::Char(_) => bridge::LitKind::Char,
         ast::LiteralKind::Byte(_) => bridge::LitKind::Byte,
         ast::LiteralKind::Bool(_) => unreachable!(),
diff --git a/crates/proc-macro-srv/src/server/rust_analyzer_span.rs b/crates/proc-macro-srv/src/server/rust_analyzer_span.rs
index dce4c60b2f..1b883c87ea 100644
--- a/crates/proc-macro-srv/src/server/rust_analyzer_span.rs
+++ b/crates/proc-macro-srv/src/server/rust_analyzer_span.rs
@@ -77,11 +77,11 @@ impl server::FreeFunctions for RaSpanServer {
 
         // FIXME: handle more than just int and float suffixes
         let suffix = match literal.kind() {
-            ast::LiteralKind::FloatNumber(num) => num.suffix(),
-            ast::LiteralKind::IntNumber(num) => num.suffix(),
+            ast::LiteralKind::FloatNumber(num) => num.suffix().map(ToString::to_string),
+            ast::LiteralKind::IntNumber(num) => num.suffix().map(ToString::to_string),
             _ => None,
         }
-        .map(|suffix| Symbol::intern(self.interner, suffix));
+        .map(|suffix| Symbol::intern(self.interner, &suffix));
 
         Ok(bridge::Literal {
             kind,
diff --git a/crates/proc-macro-srv/src/server/token_id.rs b/crates/proc-macro-srv/src/server/token_id.rs
index b237522874..7d2781d89f 100644
--- a/crates/proc-macro-srv/src/server/token_id.rs
+++ b/crates/proc-macro-srv/src/server/token_id.rs
@@ -69,11 +69,11 @@ impl server::FreeFunctions for TokenIdServer {
 
         // FIXME: handle more than just int and float suffixes
         let suffix = match literal.kind() {
-            ast::LiteralKind::FloatNumber(num) => num.suffix(),
-            ast::LiteralKind::IntNumber(num) => num.suffix(),
+            ast::LiteralKind::FloatNumber(num) => num.suffix().map(ToString::to_string),
+            ast::LiteralKind::IntNumber(num) => num.suffix().map(ToString::to_string),
             _ => None,
         }
-        .map(|suffix| Symbol::intern(self.interner, suffix));
+        .map(|suffix| Symbol::intern(self.interner, &suffix));
 
         Ok(bridge::Literal {
             kind,