diff --git a/apps/sample/polygonmesh_zonohedra/polygonmesh_zonohedra.cpp b/apps/sample/polygonmesh_zonohedra/polygonmesh_zonohedra.cpp
index 75b1a1d6..995bad0a 100644
--- a/apps/sample/polygonmesh_zonohedra/polygonmesh_zonohedra.cpp
+++ b/apps/sample/polygonmesh_zonohedra/polygonmesh_zonohedra.cpp
@@ -89,7 +89,7 @@ void example2(){
             z.addVector(a,b,c);
         }
 
-        printf("Building %s from %d vectors...\n",fullMeshFilename, z.vectors().size() );
+        printf("Building %s from %lu vectors...\n",fullMeshFilename, z.vectors().size() );
 
         MyMesh m;
         z.createMesh(m);
@@ -106,7 +106,7 @@ void example2(){
 
 }
 
-int main(int argc, char *argv[]){
+int main(int , char **){
     example1();
     example2();
     return 0;