diff --git a/src/bootstrap/dist.rs b/src/bootstrap/dist.rs
index 2d86ff1d2ba..02e35d2436e 100644
--- a/src/bootstrap/dist.rs
+++ b/src/bootstrap/dist.rs
@@ -962,7 +962,7 @@ impl Step for PlainSourceTarball {
             "Cargo.toml",
             "Cargo.lock",
         ];
-        let src_dirs = ["src", "compiler", "library"];
+        let src_dirs = ["src", "compiler", "library", "tests"];
 
         copy_src_dirs(builder, &builder.src, &src_dirs, &[], &plain_dst_src);