diff --git a/Snippets/symfont.py b/Snippets/symfont.py
index 63bb45575..a182a0c29 100755
--- a/Snippets/symfont.py
+++ b/Snippets/symfont.py
@@ -164,10 +164,10 @@ class GlyphStatistics(object):
 	#  Var(X) = E[X^2] - E[X]^2
 	@property
 	def VarianceX(self):
-		return self.Moment2XX / self.Area - self.MeanX**2
+		return max(0, self.Moment2XX / self.Area - self.MeanX**2)
 	@property
 	def VarianceY(self):
-		return self.Moment2YY / self.Area - self.MeanY**2
+		return max(0, self.Moment2YY / self.Area - self.MeanY**2)
 	
 	@property
 	def StdDevX(self):