diff --git a/buildglyphs.patel b/buildglyphs.patel
index 4668b76..5612664 100644
--- a/buildglyphs.patel
+++ b/buildglyphs.patel
@@ -119,7 +119,7 @@ export as build : define [buildFont para recursive recursiveCodes] : begin
 	define SB para.sb
 	define CAP para.cap
 	define XH para.xheight
-	define DESCENDER para.descender
+	define DESCENDER : fallback para.descender (XH - CAP)
 	# Key metrics for symbols
 	local parenTop ((XH * 0.625) + (CAP - XH) * 2.5)
 	local parenBot ((XH * 0.625) - (CAP - XH) * 2.5)
diff --git a/parameters.toml b/parameters.toml
index 53898b9..167f8fc 100644
--- a/parameters.toml
+++ b/parameters.toml
@@ -8,7 +8,7 @@ licence = '''This font software is licenced under the SIL Open Font Licence, Ver
 width = 500
 cap = 735
 xheight = 530
-descender = -205
+#descender = -205 # Unnecessary
 accent = 155
 accentx = 200
 overshoot = -8