1 files changed, 4 insertions, 0 deletions
diff --git a/thrdvar.h b/thrdvar.h
index 5406085fb8..b3f3be5994 100644
--- a/thrdvar.h
+++ b/thrdvar.h
@@ -17,6 +17,10 @@
 
 /* Important ones in the first cache line (if alignment is done right) */
 
+#ifdef USE_THREADS
+PERLVAR(interp,		PerlInterpreter*)	/* thread owner */
+#endif
+
 PERLVAR(Tstack_sp,	SV **)		/* top of the stack */
 #ifdef OP_IN_REGISTER
 PERLVAR(Topsave,	OP *)