1 files changed, 1 insertions, 1 deletions
diff --git a/mathoms.c b/mathoms.c
index 152a64c089..1477f122b1 100644
--- a/mathoms.c
+++ b/mathoms.c
@@ -83,7 +83,7 @@ PERL_CALLCONV I32 Perl_my_lstat(pTHX);
 PERL_CALLCONV I32 Perl_sv_eq(pTHX_ register SV *sv1, register SV *sv2);
 PERL_CALLCONV char * Perl_sv_collxfrm(pTHX_ SV *const sv, STRLEN *const nxp);
 PERL_CALLCONV bool Perl_sv_2bool(pTHX_ register SV *const sv);
-PERL_CALLCONV void Perl_mro_isa_changed_in(HV* stash);
+PERL_CALLCONV void Perl_mro_isa_changed_in(pTHX_ HV* stash);
 
 /* ref() is now a macro using Perl_doref;
  * this version provided for binary compatibility only.