diff --git a/tracy/tracy/inc/soleillib.h b/tracy/tracy/inc/soleillib.h
index 3fc4b89e36f534a623b2a2eab9bbc6637c59e954..f3a240686c72265ad48e8e16ec1705470cdcc866 100644
--- a/tracy/tracy/inc/soleillib.h
+++ b/tracy/tracy/inc/soleillib.h
@@ -34,7 +34,7 @@ void PhasePortrait2(long pos,double x0,double px0,double z0, double pz0, double
 void Multipole_thicksext(char const *fic_hcorr, char const *fic_vcorr, char const *fic_skew);
 void Multipole_thinsext(char const *fic_hcorr, char const *fic_vcorr, char const *fic_skew);
 void MomentumAcceptance(long deb, long fin, double ep_min, double ep_max, long nstepp,
-                        double em_min, double em_max, long nstepm);
+                        double em_min, double em_max, long nstepm, long nturn);
 
 void Trac_Tab(double x, double px, double y, double py, double dp,
             long nmax, long pos, long *lastn, long *lastpos, FILE *outf1, double Tx[][NTURN]);