diff --git a/boot.go b/boot.go
index 9fd41df..1d1bdc9 100644
--- a/boot.go
+++ b/boot.go
@@ -202,7 +202,7 @@ func bootSyntax(t Trace) (*Syntax, error) {
 		return nil, err
 	}
 
-	f, err := os.Open("syntax.p")
+	f, err := os.Open("syntax.parser")
 	if err != nil {
 		return nil, err
 	}
diff --git a/boot_test.go b/boot_test.go
index 2922811..bdebf74 100644
--- a/boot_test.go
+++ b/boot_test.go
@@ -14,7 +14,7 @@ func TestBoot(t *testing.T) {
 		return
 	}
 
-	f, err := os.Open("syntax.p")
+	f, err := os.Open("syntax.parser")
 	if err != nil {
 		t.Error(err)
 		return
diff --git a/eskip.p b/eskip.parser
similarity index 100%
rename from eskip.p
rename to eskip.parser
diff --git a/eskip_test.go b/eskip_test.go
index 0a2915a..cee6401 100644
--- a/eskip_test.go
+++ b/eskip_test.go
@@ -727,7 +727,7 @@ func TestEskip(t *testing.T) {
 	r := generateEskip(1 << 9)
 	e := eskip.Print(true, r...)
 	b := bytes.NewBufferString(e)
-	s, err := testSyntax("eskip.p", 0)
+	s, err := testSyntax("eskip.parser", 0)
 	if err != nil {
 		t.Error(err)
 		return
diff --git a/json.p b/json.parser
similarity index 100%
rename from json.p
rename to json.parser
diff --git a/json_test.go b/json_test.go
index 7bc1a29..eb449e0 100644
--- a/json_test.go
+++ b/json_test.go
@@ -285,7 +285,7 @@ func jsonTreeToJSON(n *Node) (interface{}, error) {
 }
 
 func TestJSON(t *testing.T) {
-	test(t, "json.p", "value", []testItem{{
+	test(t, "json.parser", "value", []testItem{{
 		msg:  "true",
 		text: "true",
 		node: &Node{
@@ -509,7 +509,7 @@ func TestRandomJSON(t *testing.T) {
 
 	buf := bytes.NewBuffer(b)
 
-	s, err := testSyntax("json.p", 0)
+	s, err := testSyntax("json.parser", 0)
 	if err != nil {
 		t.Error(err)
 		return
diff --git a/keyval_test.go b/keyval_test.go
index 8c58d96..a948e4c 100644
--- a/keyval_test.go
+++ b/keyval_test.go
@@ -3,7 +3,7 @@ package parse
 import "testing"
 
 func TestKeyVal(t *testing.T) {
-	test(t, "keyval.p", "doc", []testItem{{
+	test(t, "keyval.parser", "doc", []testItem{{
 		msg: "empty",
 	}, {
 		msg:  "a comment",
diff --git a/mml.p b/mml.parser
similarity index 100%
rename from mml.p
rename to mml.parser
diff --git a/mml_test.go b/mml_test.go
index 19c8678..7419d64 100644
--- a/mml_test.go
+++ b/mml_test.go
@@ -3,7 +3,7 @@ package parse
 import "testing"
 
 func TestMML(t *testing.T) {
-	test(t, "mml.p", "mml", []testItem{{
+	test(t, "mml.parser", "mml", []testItem{{
 		msg:  "empty",
 		node: &Node{Name: "mml"},
 	}, {
diff --git a/scheme.p b/scheme.parser
similarity index 100%
rename from scheme.p
rename to scheme.parser
diff --git a/scheme_test.go b/scheme_test.go
index 1946466..15f07a3 100644
--- a/scheme_test.go
+++ b/scheme_test.go
@@ -3,7 +3,7 @@ package parse
 import "testing"
 
 func TestScheme(t *testing.T) {
-	test(t, "scheme.p", "scheme", []testItem{{
+	test(t, "scheme.parser", "scheme", []testItem{{
 		msg: "empty",
 	}, {
 		msg: "a function",
diff --git a/sexpr.p b/sexpr.parser
similarity index 100%
rename from sexpr.p
rename to sexpr.parser
diff --git a/sexpr_test.go b/sexpr_test.go
index 0628b45..67c16c2 100644
--- a/sexpr_test.go
+++ b/sexpr_test.go
@@ -3,7 +3,7 @@ package parse
 import "testing"
 
 func TestSExpr(t *testing.T) {
-	test(t, "sexpr.p", "s-expression", []testItem{{
+	test(t, "sexpr.parser", "s-expression", []testItem{{
 		msg:  "number",
 		text: "42",
 		nodes: []*Node{{
diff --git a/syntax.p b/syntax.parser
similarity index 100%
rename from syntax.p
rename to syntax.parser