diff --git a/make_dyadic_vectors.cc b/make_dyadic_vectors.cc
index a0baeca089946955d292583dc40cefd2b2e51524..e92435cb1dbce913d42d8cc2b79eab84ee004a02 100644
--- a/make_dyadic_vectors.cc
+++ b/make_dyadic_vectors.cc
@@ -13,7 +13,7 @@ int main ( int argc, char **argv ){
   if(argc<4){
     cerr<<"usage: make_dyadic_vectors <theta_vol> <phi_vol> [mask] <output>"<<endl;
     cerr<<"[mask] is optional"<<endl;
-    exit(0);
+    exit(1);
   }
 
   volume4D<float> ths,phs;