diff --git a/src/common/gamecode/report.c b/src/common/gamecode/report.c
index 5c0047789..a2c52db89 100644
--- a/src/common/gamecode/report.c
+++ b/src/common/gamecode/report.c
@@ -186,6 +186,8 @@ season(int turn)
 	year  = t/(months_per_year * weeks_per_month) + 1;
 	month = (t - (year-1) * months_per_year * weeks_per_month)/weeks_per_month;
 
+	assert(month >= 0 && month < months_per_year);
+
 	return month_season[month];
 }
 
diff --git a/src/common/kernel/eressea.h b/src/common/kernel/eressea.h
index dc60ee1ce..c013d689b 100644
--- a/src/common/kernel/eressea.h
+++ b/src/common/kernel/eressea.h
@@ -1178,7 +1178,11 @@ extern void reorder_owners(struct region * r);
 
 extern const char *localenames[];
 
-#define FIRST_TURN 184
+/* FIRST_TURN is only used in eressea */
+
+#ifndef FIRST_TURN
+#define FIRST_TURN 0
+#endif
 
 #include <log.h>
 
diff --git a/src/common/settings-eressea.h b/src/common/settings-eressea.h
index 2d41e32e7..bde50896e 100644
--- a/src/common/settings-eressea.h
+++ b/src/common/settings-eressea.h
@@ -45,3 +45,8 @@
 #define ARENA_MODULE
 
 #define MAILITPATH	"/usr/sbin:$HOME/eressea/bin:/bin:/usr/bin:/usr/local/bin"
+
+/* Krücke für die Berechnung der Jahreszeiten in Eressea */
+
+#define FIRST_TURN 184
+