diff --git a/src/Compilation.zig b/src/Compilation.zig
index d62856b0111be20def4ebf322ee0f58831995161..df6fc7b06b192553ca5faed923c4a9b4406814f5 100644
--- a/src/Compilation.zig
+++ b/src/Compilation.zig
@@ -2134,6 +2134,9 @@ pub fn create(gpa: Allocator, arena: Allocator, io: Io, diag: *CreateDiagnostic,
         comp.config.any_fuzz = any_fuzz;
 
         if (opt_zcu) |zcu| {
+            // Finish initializing the `zcu` after the fields on `comp` have been initialized.
+            zcu.initAfterCompilation();
+
             // Populate `zcu.module_roots`.
             const active = zcu.acquire();
             defer active.release();
diff --git a/src/Zcu.zig b/src/Zcu.zig
index d3c180b63eb8854ec8598cdb3099bba7a41fb2b3..d71d8ecf80ef074a1800c9d637744a023523fede 100644
--- a/src/Zcu.zig
+++ b/src/Zcu.zig
@@ -2825,6 +2825,11 @@ pub const CompileError = error{
 
 pub fn init(zcu: *Zcu, gpa: Allocator, io: Io, thread_count: usize) !void {
     try zcu.intern_pool.init(gpa, io, thread_count);
+}
+
+/// It is valid to not call this function before `deinit` in error paths.
+/// Requires the fields on `zcu.comp` to already be initialized.
+pub fn initAfterCompilation(zcu: *Zcu) void {
     zcu.initTracyPlots();
 }