diff --git a/src/frontend/com_alias.h b/src/frontend/com_alias.h
index b7b06f697..45747769c 100644
--- a/src/frontend/com_alias.h
+++ b/src/frontend/com_alias.h
@@ -6,6 +6,8 @@
 #ifndef ngspice_COM_ALIAS_H
 #define ngspice_COM_ALIAS_H
 
+#include "ngspice/wordlist.h"
+
 void com_alias(wordlist *wl);
 void com_unalias(wordlist *wl);