diff --git a/src/dune/__main__.py b/src/dune/__main__.py
index b7a7c552..23d403d0 100644
--- a/src/dune/__main__.py
+++ b/src/dune/__main__.py
@@ -1,3 +1,5 @@
+import sys  # sys.exit()
+
 from args import arg_parser
 from args import parse_optional
 from dune import dune
@@ -159,6 +161,8 @@
         except KeyboardInterrupt:
             pass
         except dune_node_not_found as err:
-            print('Node not found [' + err.name() + ']')
+            print('Node not found [' + err.name() + ']', file=sys.stderr)
+            sys.exit(1)
         except dune_error as err:
-            print("Internal Error")
+            print("Internal Error", file=sys.stderr)
+            sys.exit(1)