3 files changed, 2 insertions, 8 deletions
diff --git a/embed.fnc b/embed.fnc
index deff9ad39f..54389d5b0c 100644
--- a/embed.fnc
+++ b/embed.fnc
@@ -341,7 +341,7 @@ Ap	|void	|gp_free	|NULLOK GV* gv
 Ap	|GP*	|gp_ref		|NULLOK GP* gp
 Ap	|GV*	|gv_AVadd	|NN GV* gv
 Ap	|GV*	|gv_HVadd	|NN GV* gv
-Ap	|GV*	|gv_IOadd	|NN GV* gv
+Ap	|GV*	|gv_IOadd	|NULLOK GV* gv
 ApR	|GV*	|gv_autoload4	|NULLOK HV* stash|NN const char* name|STRLEN len|I32 method
 Ap	|void	|gv_check	|NN const HV* stash
 Ap	|void	|gv_efullname	|NN SV* sv|NN const GV* gv
diff --git a/gv.c b/gv.c
index f24a7f1531..f16e0ac833 100644
--- a/gv.c
+++ b/gv.c
@@ -84,8 +84,6 @@ Perl_gv_IOadd(pTHX_ register GV *gv)
 {
     dVAR;
 
-    PERL_ARGS_ASSERT_GV_IOADD;
-
     if (!gv || SvTYPE((const SV *)gv) != SVt_PVGV) {
 
         /*
diff --git a/proto.h b/proto.h
index 53c738e856..824113257d 100644
--- a/proto.h
+++ b/proto.h
@@ -842,11 +842,7 @@ PERL_CALLCONV GV*	Perl_gv_HVadd(pTHX_ GV* gv)
 #define PERL_ARGS_ASSERT_GV_HVADD	\
 	assert(gv)
 
-PERL_CALLCONV GV*	Perl_gv_IOadd(pTHX_ GV* gv)
-			__attribute__nonnull__(pTHX_1);
-#define PERL_ARGS_ASSERT_GV_IOADD	\
-	assert(gv)
-
+PERL_CALLCONV GV*	Perl_gv_IOadd(pTHX_ GV* gv);
 PERL_CALLCONV GV*	Perl_gv_autoload4(pTHX_ HV* stash, const char* name, STRLEN len, I32 method)
 			__attribute__warn_unused_result__
 			__attribute__nonnull__(pTHX_2);