diff --git a/src/chat/cpim/parser/cpim-parser.h b/src/chat/cpim/parser/cpim-parser.h
index 841b7e18c..c5e0ffb4a 100644
--- a/src/chat/cpim/parser/cpim-parser.h
+++ b/src/chat/cpim/parser/cpim-parser.h
@@ -70,6 +70,9 @@ namespace Cpim {
 	template<>
 	bool Parser::coreHeaderIsValid<DateTimeHeader>(const std::string &headerValue) const;
 
+	template<>
+	bool Parser::coreHeaderIsValid<MessageIdHeader>(const std::string &headerValue) const;
+
 	template<>
 	bool Parser::coreHeaderIsValid<SubjectHeader>(const std::string &headerValue) const;