diff --git a/ext/curl/interface.c b/ext/curl/interface.c
index 8aec63ca501a..aced7d0b6551 100644
--- a/ext/curl/interface.c
+++ b/ext/curl/interface.c
@@ -3018,6 +3018,8 @@ PHP_FUNCTION(curl_reset)
 	}
 
 	curl_easy_reset(ch->cp);
+	zval_ptr_dtor(&ch->private_data);
+	ZVAL_UNDEF(&ch->private_data);
 	_php_curl_reset_handlers(ch);
 	_php_curl_set_default_options(ch);
 }
diff --git a/ext/curl/tests/curl_reset_private.phpt b/ext/curl/tests/curl_reset_private.phpt
new file mode 100644
index 000000000000..400079135cf7
--- /dev/null
+++ b/ext/curl/tests/curl_reset_private.phpt
@@ -0,0 +1,15 @@
+--TEST--
+curl_reset(): CURLOPT_PRIVATE is cleared
+--EXTENSIONS--
+curl
+--FILE--
+<?php
+$ch = curl_init();
+curl_setopt($ch, CURLOPT_PRIVATE, "secret-marker");
+var_dump(curl_getinfo($ch, CURLINFO_PRIVATE));
+curl_reset($ch);
+var_dump(curl_getinfo($ch, CURLINFO_PRIVATE));
+?>
+--EXPECT--
+string(13) "secret-marker"
+bool(false)