diff --git a/src/kernel/xmlreader.h b/src/kernel/xmlreader.h
index 5dfb643f1..290b785c3 100644
--- a/src/kernel/xmlreader.h
+++ b/src/kernel/xmlreader.h
@@ -12,6 +12,9 @@ without prior permission by the authors of Eressea.
 
 #ifndef H_KRNL_XMLREADER_H
 #define H_KRNL_XMLREADER_H
+
+struct spell;
+
 #ifdef __cplusplus
 extern "C" {
 #endif