diff --git a/src/common/kernel/skill.c b/src/common/kernel/skill.c
index d40ad63f8..e6b5c9635 100644
--- a/src/common/kernel/skill.c
+++ b/src/common/kernel/skill.c
@@ -295,7 +295,7 @@ reduce_skill(unit *u, skill * sv, int weeks)
 		reroll = true;
 	}
 	if (reroll) sv->weeks = (unsigned char)skill_weeks(sv->level);
-	assert(sv->level>=0 && sv->weeks>=0 && sv->weeks<=sv->level*2+1);
+	assert(sv->weeks<=sv->level*2+1);
 }
 
 int