diff --git a/ccops.cc b/ccops.cc
index faae507444ac2adf5546743076b021272f9e3bcc..0717378a6b142f7b2f1fe83e44286c210c55a92c 100644
--- a/ccops.cc
+++ b/ccops.cc
@@ -804,6 +804,7 @@ int main ( int argc, char **argv ){
       if(opts.scheme.value() == "fuzzy"){
 	volume<float> umask;
 	umask.reinitialize(mask.xsize(),mask.ysize(),mask.zsize());
+	copybasicproperties(mask,umask);
 	//OUT(U);
 	for(int cl=1;cl<=opts.nclusters.value();cl++){
 	  umask=0;