diff --git a/src/common/kernel/battle.c b/src/common/kernel/battle.c
index b0604bc9c..fea1d80a8 100644
--- a/src/common/kernel/battle.c
+++ b/src/common/kernel/battle.c
@@ -3054,6 +3054,7 @@ simplename(region * r)
 		}
 		if (isspace(c)) name[i] = '_';
 		else name[i] = *cp;
+		if (c==0) break;
 	}
 	name[i]=0;
 	return name;