diff --git a/src/testflockfev.bzz b/src/testflockfev.bzz
index db06359..de70966 100644
--- a/src/testflockfev.bzz
+++ b/src/testflockfev.bzz
@@ -16,7 +16,7 @@ TARGET_ALTITUDE = 5.0
  
 # Lennard-Jones parameters
 TARGET     = 10.0	#0.000001001
-EPSILON    = 20.0	#0.001
+EPSILON    = 15.0	#0.001
  
 # Lennard-Jones interaction magnitude
 function lj_magnitude(dist, target, epsilon) {