diff --git a/lib/loader.js b/lib/loader.js
index 39f13f56..c75f4840 100644
--- a/lib/loader.js
+++ b/lib/loader.js
@@ -25,7 +25,7 @@ var CHOMPING_KEEP  = 3;
 var PATTERN_NON_PRINTABLE         = /[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x84\x86-\x9F\uFFFE\uFFFF]|[\uD800-\uDBFF](?![\uDC00-\uDFFF])|(?:[^\uD800-\uDBFF]|^)[\uDC00-\uDFFF]/;
 var PATTERN_NON_ASCII_LINE_BREAKS = /[\x85\u2028\u2029]/;
 var PATTERN_FLOW_INDICATORS       = /[,\[\]\{\}]/;
-var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z\-]+!)$/i;
+var PATTERN_TAG_HANDLE            = /^(?:!|!!|![a-z0-9\-]+!)$/i;
 var PATTERN_TAG_URI               = /^(?:!|[^,\[\]\{\}])(?:%[0-9a-f]{2}|[0-9a-z\-#;\/\?:@&=\+\$,_\.!~\*'\(\)\[\]])*$/i;
 
 
diff --git a/test/samples-common/digit-tag-directive.js b/test/samples-common/digit-tag-directive.js
new file mode 100644
index 00000000..0f0113e9
--- /dev/null
+++ b/test/samples-common/digit-tag-directive.js
@@ -0,0 +1,6 @@
+'use strict';
+
+module.exports = {
+  'k1': 'some-string',
+  'k2': '123'
+};
diff --git a/test/samples-common/digit-tag-directive.yml b/test/samples-common/digit-tag-directive.yml
new file mode 100644
index 00000000..275567ab
--- /dev/null
+++ b/test/samples-common/digit-tag-directive.yml
@@ -0,0 +1,5 @@
+%TAG !123digit! tag:yaml.org,2002:
+%TAG !a-23-1! tag:yaml.org,2002:
+---
+k1: !123digit!str some-string
+k2: !a-23-1!str 123