diff --git a/crates/test-utils/src/fixture.rs b/crates/test-utils/src/fixture.rs
index 75e7a3fec00..3f8b5a08969 100644
--- a/crates/test-utils/src/fixture.rs
+++ b/crates/test-utils/src/fixture.rs
@@ -313,7 +313,7 @@ fn parse_meta_line(meta: &str) -> Fixture {
 }
 
 impl MiniCore {
-    const RAW_SOURCE: &str = include_str!("./minicore.rs");
+    const RAW_SOURCE: &'static str = include_str!("./minicore.rs");
 
     fn has_flag(&self, flag: &str) -> bool {
         self.activated_flags.iter().any(|it| it == flag)