diff --git a/tools/aconfig/src/commands.rs b/tools/aconfig/src/commands.rs
index cd53371eae..0c4f54326e 100644
--- a/tools/aconfig/src/commands.rs
+++ b/tools/aconfig/src/commands.rs
@@ -339,7 +339,7 @@ pub fn modify_parsed_flags_based_on_mode(
         }
     };
     if modified_parsed_flags.is_empty() {
-        bail!("{} library contains no exported flags.", codegen_mode);
+        bail!("{codegen_mode} library contains no {codegen_mode} flags");
     }
 
     Ok(modified_parsed_flags)
@@ -653,9 +653,6 @@ mod tests {
         parsed_flags.parsed_flag.retain_mut(|pf| !pf.is_exported());
         let error =
             modify_parsed_flags_based_on_mode(parsed_flags, CodegenMode::Exported).unwrap_err();
-        assert_eq!(
-            format!("{} library contains no exported flags.", CodegenMode::Exported),
-            format!("{:?}", error)
-        );
+        assert_eq!("exported library contains no exported flags", format!("{:?}", error));
     }
 }