diff --git a/src/Compilation.zig b/src/Compilation.zig
index 8787d679e6ca3c4da57af00c4ed39cb188d4c0bb..af98fc6f6ec20b57b443a99fc3ccfd1e1298731e 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -3685,7 +3685,10 @@ fn performAllTheWorkInner(
         zcu.codegen_prog_node = main_progress_node.start("Code Generation", 0);
     }
 
-    if (!InternPool.single_threaded) comp.thread_pool.spawnWgId(&work_queue_wait_group, codegenThread, .{comp});
+    if (!InternPool.single_threaded) {
+        comp.codegen_work.done = false; // may be `true` from a prior update
+        comp.thread_pool.spawnWgId(&work_queue_wait_group, codegenThread, .{comp});
+    }
     defer if (!InternPool.single_threaded) {
         {
             comp.codegen_work.mutex.lock();