diff --git a/api/api.go b/api/api.go
index 0efb10bbb..0e96043b8 100644
--- a/api/api.go
+++ b/api/api.go
@@ -156,7 +156,7 @@ type Config struct {
 	// TLSConfig is ignored if HttpClient is set.
 	TLSConfig *TLSConfig
 
-	Headers http.Header
+	Header http.Header
 }
 
 // ClientConfig copies the configuration with a new client address, region, and
@@ -676,7 +676,7 @@ func (c *Client) newRequest(method, path string) (*request, error) {
 		}
 	}
 
-	r.header = c.config.Headers
+	r.header = c.config.Header
 
 	return r, nil
 }
diff --git a/api/api_test.go b/api/api_test.go
index 0048ecdfe..ccfc2b38e 100644
--- a/api/api_test.go
+++ b/api/api_test.go
@@ -344,7 +344,7 @@ func TestParseWriteMeta(t *testing.T) {
 func TestClientHeader(t *testing.T) {
 	t.Parallel()
 	c, s := makeClient(t, func(c *Config) {
-		c.Headers = http.Header{
+		c.Header = http.Header{
 			"Hello": []string{"World"},
 		}
 	}, nil)