diff --git a/.gitignore b/.gitignore
index a6ef824..e69de29 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +0,0 @@
-/bazel-*
diff --git a/config.go b/config.go
index 9f97ed6..297b25f 100644
--- a/config.go
+++ b/config.go
@@ -34,6 +34,7 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"io/ioutil"
 	"os"
 	osuser "os/user"
 	"path/filepath"
@@ -195,26 +196,29 @@ func parseFile(filename string) (*Config, error) {
 }
 
 func parseWithDepth(filename string, depth uint8) (*Config, error) {
-	f, err := os.Open(filename)
+	b, err := ioutil.ReadFile(filename)
 	if err != nil {
 		return nil, err
 	}
-	defer f.Close()
-	return decode(f, isSystem(filename), depth)
+	return decodeBytes(b, isSystem(filename), depth)
 }
 
 func isSystem(filename string) bool {
-	// TODO i'm not sure this is the best way to detect a system repo
+	// TODO: not sure this is the best way to detect a system repo
 	return strings.HasPrefix(filepath.Clean(filename), "/etc/ssh")
 }
 
 // Decode reads r into a Config, or returns an error if r could not be parsed as
 // an SSH config file.
 func Decode(r io.Reader) (*Config, error) {
-	return decode(r, false, 0)
+	b, err := ioutil.ReadAll(r)
+	if err != nil {
+		return nil, err
+	}
+	return decodeBytes(b, false, 0)
 }
 
-func decode(r io.Reader, system bool, depth uint8) (c *Config, err error) {
+func decodeBytes(b []byte, system bool, depth uint8) (c *Config, err error) {
 	defer func() {
 		if r := recover(); r != nil {
 			if _, ok := r.(runtime.Error); ok {
@@ -228,7 +232,7 @@ func decode(r io.Reader, system bool, depth uint8) (c *Config, err error) {
 		}
 	}()
 
-	c = parseSSH(lexSSH(r), system, depth)
+	c = parseSSH(lexSSH(b), system, depth)
 	return c, err
 }
 
diff --git a/lexer.go b/lexer.go
index 5c1c39b..11680b4 100644
--- a/lexer.go
+++ b/lexer.go
@@ -1,17 +1,17 @@
 package ssh_config
 
 import (
-	"io"
-
-	buffruneio "github.com/pelletier/go-buffruneio"
+	"bytes"
 )
 
 // Define state functions
 type sshLexStateFn func() sshLexStateFn
 
 type sshLexer struct {
-	input         *buffruneio.Reader // Textual source
-	buffer        []rune             // Runes composing the current token
+	inputIdx int
+	input    []rune // Textual source
+
+	buffer        []rune // Runes composing the current token
 	tokens        chan token
 	line          int
 	col           int
@@ -114,16 +114,14 @@ func (s *sshLexer) lexRvalue() sshLexStateFn {
 }
 
 func (s *sshLexer) read() rune {
-	r, _, err := s.input.ReadRune()
-	if err != nil {
-		panic(err)
-	}
+	r := s.peek()
 	if r == '\n' {
 		s.endbufferLine++
 		s.endbufferCol = 1
 	} else {
 		s.endbufferCol++
 	}
+	s.inputIdx++
 	return r
 }
 
@@ -197,21 +195,22 @@ func (s *sshLexer) emitWithValue(t tokenType, value string) {
 }
 
 func (s *sshLexer) peek() rune {
-	r, _, err := s.input.ReadRune()
-	if err != nil {
-		panic(err)
+	if s.inputIdx >= len(s.input) {
+		return eof
 	}
-	s.input.UnreadRune()
+
+	r := s.input[s.inputIdx]
 	return r
 }
 
 func (s *sshLexer) follow(next string) bool {
+	inputIdx := s.inputIdx
 	for _, expectedRune := range next {
-		r, _, err := s.input.ReadRune()
-		defer s.input.UnreadRune()
-		if err != nil {
-			panic(err)
+		if inputIdx >= len(s.input) {
+			return false
 		}
+		r := s.input[inputIdx]
+		inputIdx++
 		if expectedRune != r {
 			return false
 		}
@@ -226,10 +225,10 @@ func (s *sshLexer) run() {
 	close(s.tokens)
 }
 
-func lexSSH(input io.Reader) chan token {
-	bufferedInput := buffruneio.NewReader(input)
+func lexSSH(input []byte) chan token {
+	runes := bytes.Runes(input)
 	l := &sshLexer{
-		input:         bufferedInput,
+		input:         runes,
 		tokens:        make(chan token),
 		line:          1,
 		col:           1,
diff --git a/parser.go b/parser.go
index 10a2263..36c4205 100644
--- a/parser.go
+++ b/parser.go
@@ -169,6 +169,12 @@ func (p *sshParser) parseComment() sshParserStateFn {
 }
 
 func parseSSH(flow chan token, system bool, depth uint8) *Config {
+	// Ensure we consume tokens to completion even if parser exits early
+	defer func() {
+		for range flow {
+		}
+	}()
+
 	result := newConfig()
 	result.position = Position{1, 1}
 	parser := &sshParser{
diff --git a/parser_test.go b/parser_test.go
new file mode 100644
index 0000000..ff1ab2f
--- /dev/null
+++ b/parser_test.go
@@ -0,0 +1,24 @@
+package ssh_config
+
+import (
+	"errors"
+	"testing"
+)
+
+type errReader struct {
+}
+
+func (b *errReader) Read(p []byte) (n int, err error) {
+	return 0, errors.New("read error occurred")
+}
+
+func TestIOError(t *testing.T) {
+	buf := &errReader{}
+	_, err := Decode(buf)
+	if err == nil {
+		t.Fatal("expected non-nil err, got nil")
+	}
+	if err.Error() != "read error occurred" {
+		t.Errorf("expected read error msg, got %v", err)
+	}
+}