diff --git a/test/blackbox-tests/jbuild b/test/blackbox-tests/jbuild
index 032d8776..70e2a201 100644
--- a/test/blackbox-tests/jbuild
+++ b/test/blackbox-tests/jbuild
@@ -134,3 +134,10 @@
   (action
    (chdir test-cases/select
     (setenv JBUILDER ${bin:jbuilder} (run ${exe:cram.exe} run.t))))))
+
+(alias
+ ((name runtest)
+  (deps ((files_recursively_in test-cases/multiple-private-libs)))
+  (action
+   (chdir test-cases/multiple-private-libs
+    (setenv JBUILDER ${bin:jbuilder} (run ${exe:cram.exe} run.t))))))
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/a/a.opam b/test/blackbox-tests/test-cases/multiple-private-libs/a/a.opam
new file mode 100644
index 00000000..e69de29b
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/a/jbuild b/test/blackbox-tests/test-cases/multiple-private-libs/a/jbuild
new file mode 100644
index 00000000..ff31db40
--- /dev/null
+++ b/test/blackbox-tests/test-cases/multiple-private-libs/a/jbuild
@@ -0,0 +1,3 @@
+(jbuild_version 1)
+
+(library ((name test)))
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/a/test.ml b/test/blackbox-tests/test-cases/multiple-private-libs/a/test.ml
new file mode 100644
index 00000000..0547b3d0
--- /dev/null
+++ b/test/blackbox-tests/test-cases/multiple-private-libs/a/test.ml
@@ -0,0 +1 @@
+let x = 1
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/b/b.opam b/test/blackbox-tests/test-cases/multiple-private-libs/b/b.opam
new file mode 100644
index 00000000..e69de29b
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/b/jbuild b/test/blackbox-tests/test-cases/multiple-private-libs/b/jbuild
new file mode 100644
index 00000000..ff31db40
--- /dev/null
+++ b/test/blackbox-tests/test-cases/multiple-private-libs/b/jbuild
@@ -0,0 +1,3 @@
+(jbuild_version 1)
+
+(library ((name test)))
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/b/test.ml b/test/blackbox-tests/test-cases/multiple-private-libs/b/test.ml
new file mode 100644
index 00000000..38f5a818
--- /dev/null
+++ b/test/blackbox-tests/test-cases/multiple-private-libs/b/test.ml
@@ -0,0 +1 @@
+let x = 2
diff --git a/test/blackbox-tests/test-cases/multiple-private-libs/run.t b/test/blackbox-tests/test-cases/multiple-private-libs/run.t
new file mode 100644
index 00000000..2432defd
--- /dev/null
+++ b/test/blackbox-tests/test-cases/multiple-private-libs/run.t
@@ -0,0 +1,5 @@
+This test checks that there is no clash when two private libraries have the same name
+
+  $ $JBUILDER build -j1 --root . @doc
+  Multiple rules generated for _build/default/_doc/test/index.html
+  [1]