diff --git a/src/python/jw/pkg/cmds/projects/CmdBuild.py b/src/python/jw/pkg/cmds/projects/CmdBuild.py
index 09f71122..3a29b899 100644
--- a/src/python/jw/pkg/cmds/projects/CmdBuild.py
+++ b/src/python/jw/pkg/cmds/projects/CmdBuild.py
@@ -162,15 +162,16 @@ class CmdBuild(Cmd):  # export
                 log(DEBUG, f'--- Adding dependency tree of module "{m}"')
                 add_dep_tree(m, dep_flavours, dep_tree, all_deps)
             while len(all_deps):
-                # Find any leaf
-                for d in all_deps:
+                # Find any leaf, deterministically: sorted, so that the
+                # order is reproducible across runs
+                for d in sorted(all_deps):
                     # Dependency d doesn't have dependencies itself
                     if not len(dep_tree[d]):
                         break  # found
                 else:  # no Leaf found
                     raise Exception(
                         'Fatal: Dependencies between these modules are unresolvable: '
-                        ', '.join(all_deps)
+                        ', '.join(sorted(all_deps))
                     )
                 order.append(d)  # do it
                 # bookkeep it