diff --git a/test/blackbox-tests/jbuild b/test/blackbox-tests/jbuild
index 9604516e..43cee20d 100644
--- a/test/blackbox-tests/jbuild
+++ b/test/blackbox-tests/jbuild
@@ -297,3 +297,13 @@
      (progn
       (run ${exe:cram.exe} run.t)
       (diff? run.t run.t.corrected)))))))
+
+(alias
+ ((name runtest)
+  (deps ((files_recursively_in test-cases/installable-dup-private-libs)))
+  (action
+   (chdir test-cases/installable-dup-private-libs
+    (setenv JBUILDER ${bin:jbuilder}
+     (progn
+      (run ${exe:cram.exe} run.t)
+      (diff? run.t run.t.corrected)))))))
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/a.ml b/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/a.ml
new file mode 100644
index 00000000..e69de29b
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/a1.opam b/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/a1.opam
new file mode 100644
index 00000000..e69de29b
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/jbuild b/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/jbuild
new file mode 100644
index 00000000..5870c1f0
--- /dev/null
+++ b/test/blackbox-tests/test-cases/installable-dup-private-libs/a1/jbuild
@@ -0,0 +1,3 @@
+(library
+ ((name a)
+  (public_name a1)))
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/a.ml b/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/a.ml
new file mode 100644
index 00000000..e69de29b
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/a2.opam b/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/a2.opam
new file mode 100644
index 00000000..e69de29b
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/jbuild b/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/jbuild
new file mode 100644
index 00000000..66780efd
--- /dev/null
+++ b/test/blackbox-tests/test-cases/installable-dup-private-libs/a2/jbuild
@@ -0,0 +1,3 @@
+(library
+ ((name a)
+  (public_name a2)))
\ No newline at end of file
diff --git a/test/blackbox-tests/test-cases/installable-dup-private-libs/run.t b/test/blackbox-tests/test-cases/installable-dup-private-libs/run.t
new file mode 100644
index 00000000..a47d9bcb
--- /dev/null
+++ b/test/blackbox-tests/test-cases/installable-dup-private-libs/run.t
@@ -0,0 +1,7 @@
+  $ $JBUILDER build @install -j1 --display short --root .
+      ocamldep a2/a.ml.d
+        ocamlc a2/.a.objs/a.{cmi,cmo,cmt}
+      ocamlopt a2/.a.objs/a.{cmx,o}
+        ocamlc a2/a.cma
+      ocamlopt a2/a.{a,cmxa}
+      ocamlopt a2/a.cmxs