diff --git a/lib/twine/placeholders.rb b/lib/twine/placeholders.rb
index 9f1828e..1c7b200 100644
--- a/lib/twine/placeholders.rb
+++ b/lib/twine/placeholders.rb
@@ -3,7 +3,7 @@ module Twine
     extend self
 
     # Note: the ` ` (single space) flag is NOT supported
-    PLACEHOLDER_FLAGS_WIDTH_PRECISION_LENGTH = '([-+0#])?(\d+|\*)?(\.(\d+|\*))?(hh?|ll?|L|z|j|t)?'
+    PLACEHOLDER_FLAGS_WIDTH_PRECISION_LENGTH = '([-+0#])?(\d+|\*)?(\.(\d+|\*))?(hh?|ll?|L|z|j|t|q)?'
     PLACEHOLDER_PARAMETER_FLAGS_WIDTH_PRECISION_LENGTH = '(\d+\$)?' + PLACEHOLDER_FLAGS_WIDTH_PRECISION_LENGTH
     PLACEHOLDER_TYPES = '[diufFeEgGxXoscpaA]'