diff --git a/modules/certauth.cpp b/modules/certauth.cpp
index 61e5687..4857d59 100644
--- a/modules/certauth.cpp
+++ b/modules/certauth.cpp
@@ -204,7 +204,7 @@ public:
 			return;
 		}
 
-		SCString::const_iterator it2 = it->second.begin();
+		SCString::iterator it2 = it->second.begin();
 		while (id > 1) {
 			++it2;
 			id--;
