diff --git a/src/cwt.c b/src/cwt.c
index 6e9efb1..20ad3b1 100755
--- a/src/cwt.c
+++ b/src/cwt.c
@@ -142,7 +142,7 @@ static void wave_function(int nk, double dt,int mother, double param,double scal
 	}
 }
 
-void cwavelet(double *y, int N, double dt, int mother, double param, double s0, double dj, int jtot, int npad,
+void cwavelet(const double *y, int N, double dt, int mother, double param, int jtot, int npad,
 	double *wave, double *scale, double *period, double *coi) {
 
 	int i, j, k, iter;
diff --git a/src/cwt.h b/src/cwt.h
index ed9ea9a..e9a80dc 100755
--- a/src/cwt.h
+++ b/src/cwt.h
@@ -7,7 +7,7 @@
 extern "C" {
 #endif
 
-void cwavelet(double *y, int N, double dt, int mother, double param, double s0, double dj, int jtot, int npad,
+void cwavelet(const double *y, int N, double dt, int mother, double param, int jtot, int npad,
 		double *wave, double *scale, double *period, double *coi);
 
 void psi0(int mother, double param, double *val, int *real);