diff --git a/quad/cquads/cquads.rl b/quad/cquads/cquads.rl
index cce8f27..53104f0 100644
--- a/quad/cquads/cquads.rl
+++ b/quad/cquads/cquads.rl
@@ -73,7 +73,8 @@
 							;
 
 	IRIREF                  = '<' (
-							  '!' .. ';'
+							  '!'
+							| '#' .. ';'
 							| '='
 							| '?' .. '['
 							| ']'
diff --git a/quad/nquads/nquads.rl b/quad/nquads/nquads.rl
index b5b3529..78a047e 100644
--- a/quad/nquads/nquads.rl
+++ b/quad/nquads/nquads.rl
@@ -64,7 +64,8 @@
 							;
 
 	IRIREF                  = '<' (
-							  '!' .. ';'
+							  '!'
+							| '#' .. ';'
 							| '='
 							| '?' .. '['
 							| ']'