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-rw-r--r--ext/zlib/zlib.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/ext/zlib/zlib.c b/ext/zlib/zlib.c
index 80b45ad0c9..e22d988406 100644
--- a/ext/zlib/zlib.c
+++ b/ext/zlib/zlib.c
@@ -2486,7 +2486,7 @@ gzreader_gets(argc, argv, obj)
if (NIL_P(rs)) {
dst = gzfile_read_all(gz);
- if (!NIL_P(dst)) gz->lineno++;
+ if (RSTRING(dst)->len != 0) gz->lineno++;
return dst;
}