diff --git a/src/test/ui/issues/issue-51345.rs b/src/test/ui/issues/issue-51345.rs
index 15571e8bf5b28..8fe9385e6cd9e 100644
--- a/src/test/ui/issues/issue-51345.rs
+++ b/src/test/ui/issues/issue-51345.rs
@@ -2,7 +2,7 @@
 #![allow(unreachable_code)]
 
 fn main() {
-    let mut v = Vec::new();
+    let mut v: Vec<()> = Vec::new();
 
     loop { v.push(break) }
 }