diff --git a/src/Handler/CurlFactory.php b/src/Handler/CurlFactory.php
index 49808e5c4..a4c5eca0f 100644
--- a/src/Handler/CurlFactory.php
+++ b/src/Handler/CurlFactory.php
@@ -288,7 +288,14 @@ private function applyHeaders(EasyHandle $easy, array &$conf)
     {
         foreach ($conf['_headers'] as $name => $values) {
             foreach ($values as $value) {
-                $conf[CURLOPT_HTTPHEADER][] = "$name: $value";
+                $value = (string) $value;
+                if ($value === '') {
+                    // cURL requires a special format for empty headers.
+                    // See https://github.com/guzzle/guzzle/issues/1882 for more details.
+                    $conf[CURLOPT_HTTPHEADER][] = "$name;";
+                } else {
+                    $conf[CURLOPT_HTTPHEADER][] = "$name: $value";
+                }
             }
         }