diff --git a/io.c b/io.c
index f01aa01498..88fdd8ae81 100644
--- a/io.c
+++ b/io.c
@@ -1428,7 +1428,7 @@ rb_io_getline(rs, fptr)
 
 	while ((c = appendline(fptr, newline, &str)) != EOF &&
 	       (c != newline || RSTRING(str)->len < rslen ||
-		(rspara || rscheck(rsptr,rslen,rs)) ||
+		(rspara || rscheck(rsptr,rslen,rs), 0) ||
 		memcmp(RSTRING(str)->ptr+RSTRING(str)->len-rslen,rsptr,rslen)));
 
 	if (rspara) {