1 files changed, 1 insertions, 0 deletions

diff --git a/proto.h b/proto.h
index 0fdceeaf63..2ea10d858f 100644
--- a/proto.h
+++ b/proto.h
@@ -2844,6 +2844,7 @@ PERL_CALLCONV U8*	Perl_nan_hibyte(pTHX_ NV *nvp, U8* mask)
 #define PERL_ARGS_ASSERT_NAN_HIBYTE	\
 	assert(nvp); assert(mask)
 
+PERL_CALLCONV int	Perl_nan_is_signaling(pTHX_ NV nv);
 PERL_CALLCONV void	Perl_nan_signaling_set(pTHX_ NV *nvp, bool signaling)
 			__attribute__nonnull__(pTHX_1);
 #define PERL_ARGS_ASSERT_NAN_SIGNALING_SET	\