diff --git a/src/private/mappings.h b/src/private/mappings.h
index aa20866..ae13096 100644
--- a/src/private/mappings.h
+++ b/src/private/mappings.h
@@ -25,9 +25,11 @@
 #ifndef UIRC_GUARD_MAPPINGS
 #define UIRC_GUARD_MAPPINGS
 
+#ifdef UIRC_IRCV3
 struct tagmapping {
 	const char* const name;
 	IRC_Tag*          assg;
 };
+#endif /* UIRC_IRCV3 */
 
 #endif /* UIRC_GUARD_MAPPINGS */