diff --git a/src/test/run-make-fulldeps/long-linker-command-lines/foo.rs b/src/test/run-make-fulldeps/long-linker-command-lines/foo.rs
index 96fb16b1fcc8f..f313798de215b 100644
--- a/src/test/run-make-fulldeps/long-linker-command-lines/foo.rs
+++ b/src/test/run-make-fulldeps/long-linker-command-lines/foo.rs
@@ -90,7 +90,7 @@ fn main() {
         }
 
         let linker_args = read_linker_args(&ok);
-        for mut arg in linker_args.split('S') {
+        for arg in linker_args.split('S') {
             expected_libs.remove(arg);
         }