diff --git a/iconvdata/ansi_x3.110.c b/iconvdata/ansi_x3.110.c
index c5506b13b8..94e6e6b745 100644
--- a/iconvdata/ansi_x3.110.c
+++ b/iconvdata/ansi_x3.110.c
@@ -407,7 +407,7 @@ static const char from_ucs4[][2] =
 	   is also available.  */					      \
 	uint32_t ch2;							      \
 									      \
-	if (inptr + 1 >= inend)						      \
+	if (inend - inptr <= 1)						      \
 	  {								      \
 	    /* The second character is not available.  */		      \
 	    result = __GCONV_INCOMPLETE_INPUT;				      \