diff --git a/tracy/tracy/src/read_script.cc b/tracy/tracy/src/read_script.cc
index 62065841c5ac2367cdd88fac5e47222113144001..3b18723d771b515583caa3da612f6e09ffaef706 100644
--- a/tracy/tracy/src/read_script.cc
+++ b/tracy/tracy/src/read_script.cc
@@ -62,7 +62,7 @@ bool MomentumAccFlag = false;
 char TrackDim[3] = "6D";
 long  _MomentumAccFlag_istart=1L, _MomentumAccFlag_istop=108L,
      _MomentumAccFlag_nstepn=100L, _MomentumAccFlag_nstepp=100L;
-double _MomentumAccFlag_deltaminn=0.01, _MomentumAccFlag_deltamaxn=0.05;
+double _MomentumAccFlag_deltaminn=-0.01, _MomentumAccFlag_deltamaxn=-0.05;
 double _MomentumAccFlag_deltaminp=0.01, _MomentumAccFlag_deltamaxp=0.05;
 
 /* Phase space */