diff --git a/.gitignore b/.gitignore
index bac9a1f..0608beb 100644
--- a/.gitignore
+++ b/.gitignore
@@ -12,3 +12,4 @@ coverage
 .yardoc
 .ruby-version
 pkg/*
+.idea
diff --git a/lib/fluent/plugin/named_pipe/fifo.rb b/lib/fluent/plugin/named_pipe/fifo.rb
index d28a4dd..922a753 100644
--- a/lib/fluent/plugin/named_pipe/fifo.rb
+++ b/lib/fluent/plugin/named_pipe/fifo.rb
@@ -31,6 +31,12 @@ def open
       end
 
       def readline
+        if nil != (idx = @buf.index("\n"))
+          line = @buf[0, idx + 1]
+          @buf = @buf[idx + 1, @buf.length - line.length]
+          return line
+        end
+
         res = IO.select([@pipe], [], [], READ_TIMEOUT)
         return nil if res.nil?