diff --git a/ChangeLog b/ChangeLog
index 3a0074b686..4b3d499799 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,10 @@
+Wed Jan  3 18:49:15 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* io.c (rb_io_getline): lineno update condition was wrong.
+	  [ruby-dev:30065]
+
+	* io.c (rb_io_getline_fast): ditto.
+
 Wed Jan  3 11:36:51 2007  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* io.c (ruby_dup): start GC on ENOMEM as well.
diff --git a/io.c b/io.c
index 9e8710897c..35c406a2a3 100644
--- a/io.c
+++ b/io.c
@@ -1644,7 +1644,7 @@ rb_io_getline_fast(OpenFile *fptr, unsigned char delim, long limit)
     }
 
     if (!NIL_P(str)) {
-	if (limit > 0) {
+	if (limit != 0) {
 	    fptr->lineno++;
 	    lineno = INT2FIX(fptr->lineno);
 	}
@@ -1740,7 +1740,7 @@ rb_io_getline(int argc, VALUE *argv, VALUE io)
     }
 
     if (!NIL_P(str)) {
-	if (limit > 0) {
+	if (limit != 0) {
 	    fptr->lineno++;
 	    lineno = INT2FIX(fptr->lineno);
 	}