diff --git a/src/config_magic.h b/src/config_magic.h
index e24d3d5218..8bc3dd3322 100644
--- a/src/config_magic.h
+++ b/src/config_magic.h
@@ -409,7 +409,7 @@ struct SpellConfig {
 struct MagicStats {
   long cost[MAGIC_OVERCHARGE_LEVELS];
   long duration;
-  long strength[MAGIC_OVERCHARGE_LEVELS];
+  long strength[MAGIC_OVERCHARGE_LEVELS+1];
 };
 
 struct MagicConfig {