diff --git a/tests/ob_dcz_005.phpt b/tests/ob_dcz_005.phpt
new file mode 100644
index 0000000..f942e7d
--- /dev/null
+++ b/tests/ob_dcz_005.phpt
@@ -0,0 +1,24 @@
+--TEST--
+output handler: dcz
+--SKIPIF--
+<?php
+include (dirname(__FILE__) . '/ob_skipif.inc');
+?>
+--GET--
+ob=dictionary
+--ENV--
+HTTP_ACCEPT_ENCODING=zstd,dcz
+HTTP_AVAILABLE_DICTIONARY=:5wg7BLZeirApJAxOdI/QBi8RvwZuIJfPf0TwMo/x/yg=:
+--FILE--
+<?php
+ini_set('zstd.output_compression', 1);
+ini_set('zstd.output_compression_dict', '');
+
+include(dirname(__FILE__) . '/data.inc');
+echo "{$data}";
+?>
+--EXPECT_EXTERNAL--
+files/ob_data.zstd
+--EXPECTHEADERS--
+Content-Encoding: zstd
+Vary: Accept-Encoding
diff --git a/zstd.c b/zstd.c
index 6623573..3e498c9 100644
--- a/zstd.c
+++ b/zstd.c
@@ -1298,6 +1298,7 @@ php_zstd_output_handler_load_dict(php_zstd_context *ctx)
     char *dict = PHP_ZSTD_G(output_compression_dict);
 
     if (!dict || strlen(dict) <= 0) {
+        PHP_ZSTD_G(compression_coding) &= ~PHP_ZSTD_ENCODING_DCZ;
         return NULL;
     }
 
@@ -1307,6 +1308,7 @@ php_zstd_output_handler_load_dict(php_zstd_context *ctx)
                                         NULL, context);
     if (!stream) {
         ZSTD_WARNING("could not open dictionary stream: %s", dict);
+        PHP_ZSTD_G(compression_coding) &= ~PHP_ZSTD_ENCODING_DCZ;
         return NULL;
     }
 
@@ -1320,6 +1322,7 @@ php_zstd_output_handler_load_dict(php_zstd_context *ctx)
     php_stream_close(stream);
 
     if (!data) {
+        PHP_ZSTD_G(compression_coding) &= ~PHP_ZSTD_ENCODING_DCZ;
         return NULL;
     }