diff --git a/header_test.go b/header_test.go
index c2b8b18e74..7ae61383b8 100644
--- a/header_test.go
+++ b/header_test.go
@@ -26,7 +26,9 @@ func TestResponseHeaderAddContentType(t *testing.T) {
 	}
 
 	var buf bytes.Buffer
-	h.WriteTo(&buf) //nolint:errcheck
+	if _, err := h.WriteTo(&buf); err != nil {
+		t.Fatalf("unexpected error when writing header: %v", err)
+	}
 
 	if n := strings.Count(buf.String(), "Content-Type: "); n != 1 {
 		t.Errorf("Content-Type occurred %d times", n)
@@ -46,7 +48,9 @@ func TestResponseHeaderAddContentEncoding(t *testing.T) {
 	}
 
 	var buf bytes.Buffer
-	h.WriteTo(&buf) //nolint:errcheck
+	if _, err := h.WriteTo(&buf); err != nil {
+		t.Fatalf("unexpected error when writing header: %v", err)
+	}
 
 	if n := strings.Count(buf.String(), "Content-Encoding: "); n != 1 {
 		t.Errorf("Content-Encoding occurred %d times", n)
@@ -138,13 +142,15 @@ func TestResponseHeaderMultiLineName(t *testing.T) {
 	}
 }
 
-func TestResponseHeaderMultiLinePaniced(t *testing.T) {
+func TestResponseHeaderMultiLinePanicked(t *testing.T) {
 	t.Parallel()
 
 	// Input generated by fuzz testing that caused the parser to panic.
 	s, _ := base64.StdEncoding.DecodeString("aAEAIDoKKDoKICA6CgkKCiA6CiA6CgkpCiA6CiA6CiA6Cig6CiAgOgoJCgogOgogOgoJKQogOgogOgogOgogOgogOgoJOg86CiA6CiA6Cig6CiAyCg==")
 	header := new(RequestHeader)
-	header.parse(s) //nolint:errcheck
+	if _, err := header.parse(s); err == nil {
+		t.Error("expected error, got <nil>")
+	}
 }
 
 func TestResponseHeaderEmptyValueFromHeader(t *testing.T) {
@@ -3021,7 +3027,9 @@ func TestAddVaryHeader(t *testing.T) {
 	}
 
 	var buf bytes.Buffer
-	h.WriteTo(&buf) //nolint:errcheck
+	if _, err := h.WriteTo(&buf); err != nil {
+		t.Fatalf("unexpected error when writing header: %v", err)
+	}
 
 	if n := strings.Count(buf.String(), "Vary: "); n != 1 {
 		t.Errorf("Vary occurred %d times", n)
@@ -3042,7 +3050,9 @@ func TestAddVaryHeaderExisting(t *testing.T) {
 	}
 
 	var buf bytes.Buffer
-	h.WriteTo(&buf) //nolint:errcheck
+	if _, err := h.WriteTo(&buf); err != nil {
+		t.Fatalf("unexpected error when writing header: %v", err)
+	}
 
 	if n := strings.Count(buf.String(), "Vary: "); n != 1 {
 		t.Errorf("Vary occurred %d times", n)
@@ -3063,7 +3073,9 @@ func TestAddVaryHeaderExistingAcceptEncoding(t *testing.T) {
 	}
 
 	var buf bytes.Buffer
-	h.WriteTo(&buf) //nolint:errcheck
+	if _, err := h.WriteTo(&buf); err != nil {
+		t.Fatalf("unexpected error when writing header: %v", err)
+	}
 
 	if n := strings.Count(buf.String(), "Vary: "); n != 1 {
 		t.Errorf("Vary occurred %d times", n)