diff --git a/lib_old/src/parsing/n3.pest b/lib_old/src/parsing/n3.pest
index f4c76bd..b18b997 100644
--- a/lib_old/src/parsing/n3.pest
+++ b/lib_old/src/parsing/n3.pest
@@ -75,7 +75,8 @@ NewLine = { "\r" | "\n" }
 Var = {"?"~ASCII_ALPHA+~ASCII_ALPHANUMERIC*}
 Prefix = {"@prefix"~SPACE+~PrefixIdentifier~":"~SPACE+~"<"~Iri~">"~WS* ~"."~WS*}
 PrefixIdentifier = {ASCII_ALPHANUMERIC*}
-Prefixed = {PrefixIdentifier ~":"~ASCII_ALPHANUMERIC+}
+LocalNameChar = {ASCII_ALPHANUMERIC | "_"}
+Prefixed = {PrefixIdentifier ~":"~LocalNameChar+}
 Term = {"<"~Iri~">" | Prefixed}
 varOrTerm = { Term | Var}
 Subject = { Term | Var}
@@ -85,4 +86,4 @@ TP = { WS*~Subject ~WS+~ Property ~WS+~ Object ~WS* ~"."? ~WS* }
 Body = {"{"~TP+~"}"}
 Head = {"{"~WS*~TP~WS*~"}"}
 rule = { Body~WS*~"=>"~WS*~Head~WS*~"."? ~WS*}
-document = {Prefix* ~ NewLine* ~rule+}
\ No newline at end of file
+document = {Prefix* ~ NewLine* ~rule+}