diff --git a/core/src/net/sf/openrocket/aerodynamics/barrowman/FinSetCalc.java b/core/src/net/sf/openrocket/aerodynamics/barrowman/FinSetCalc.java
index 7aaf412b3..b863e6138 100644
--- a/core/src/net/sf/openrocket/aerodynamics/barrowman/FinSetCalc.java
+++ b/core/src/net/sf/openrocket/aerodynamics/barrowman/FinSetCalc.java
@@ -660,7 +660,7 @@ public class FinSetCalc extends RocketComponentCalc {
 		// Airfoil assumed to have zero base drag
 		
 		// Scale to correct reference area
-		cd *= cd * span * thickness / conditions.getRefArea();
+		cd *= span * thickness / conditions.getRefArea();
 		
 		return cd;
 	}