diff --git a/src/arch/x86-64/jedino-jedro.zig b/src/arch/x86-64/jedino-jedro.zig
index 9b5b15d..b9095a6 100644
--- a/src/arch/x86-64/jedino-jedro.zig
+++ b/src/arch/x86-64/jedino-jedro.zig
@@ -31,8 +31,6 @@ const int = @import("../../interpreter.zig");
 const Word = int.Word;
 pub const RecursionLimit = int.RecursionLimit;
 
-threadlocal var return_stack: [RecursionLimit + 1]Word = undefined;
-
 // todo: Variant that pushes array of words.
 /// (iw | -- iw)
 pub fn opPushWord() callconv(.Naked) noreturn {
@@ -117,7 +115,6 @@ pub fn opReturn() callconv(.Naked) noreturn {
     );
 }
 
-// todo: Make sure it's non reentry in one given thread.
 // todo: Allow passing initial stack via array of words.
 // todo: Ensure correctness.
 // todo: Use remaining stack as return.
@@ -127,6 +124,8 @@ pub fn execute(binary: []const Word, entry_addr: usize) void {
     // https://wiki.osdev.org/System_V_ABI
     @setCold(true);
 
+    var return_stack: [RecursionLimit + 1]Word = undefined;
+
     // Such device is used so that opReturn could be used for return.
     asm volatile (
         \\     movq $0f, 8(%%r13)