diff --git a/src/wavelib.c b/src/wavelib.c
index 565a74e..d33671c 100644
--- a/src/wavelib.c
+++ b/src/wavelib.c
@@ -1418,9 +1418,12 @@ void icwt(cwt_object wt, double *cwtop) {
 	cdel = cdelta(wt->mother, wt->m, psi);
 
 	//printf("\n PSI %g CDEL %g param %g mother %d \n", psi, cdel,wt->m,wt->mother);
-
-	icwavelet(wt->params, N, wt->params+nj2, wt->J, wt->dt, wt->dj, cdel, psi, cwtop);
-	
+	if (!strcmp(wt->type, "pow") || !strcmp(wt->type, "power")) {
+		icwavelet(wt->params, N, wt->params+nj2, wt->J, wt->dt, wt->dj, cdel, psi, cwtop);
+	} else {
+		printf("Inverse CWT is only available for power of 2.0 scales \n");
+		exit(-1);
+	}
 	for(i = 0; i < N;++i) {
 		cwtop[i] += wt->smean;
 	}