diff --git a/plugins/pycv/PythonCVInterface.cpp b/plugins/pycv/PythonCVInterface.cpp
index 41b31a6b64..374c370ea1 100644
--- a/plugins/pycv/PythonCVInterface.cpp
+++ b/plugins/pycv/PythonCVInterface.cpp
@@ -666,7 +666,7 @@ void PythonCVInterface::calculate() {
     }
 
   } catch (const py::error_already_set &e) {
-    plumed_merror(e.what());
+    plumed_error_nested()<<"("<<getLabel()<<") caught a python exception:\n"<<e.what();
   }
 }
 
diff --git a/plugins/pycv/PythonFunction.cpp b/plugins/pycv/PythonFunction.cpp
index 10bd108c95..995cb60fa4 100644
--- a/plugins/pycv/PythonFunction.cpp
+++ b/plugins/pycv/PythonFunction.cpp
@@ -212,8 +212,7 @@ void PythonFunction::calculate() {
       readReturn(r, getPntrToValue());
     }
   } catch (const py::error_already_set &e) {
-    plumed_merror(e.what());
-    //vdbg(e.what());
+    plumed_error_nested()<<"("<<getLabel()<<") caught a python exception:\n"<<e.what();
   }
 }