diff --git a/private/mix_library.bzl b/private/mix_library.bzl
index efd9ea0..33f0efb 100644
--- a/private/mix_library.bzl
+++ b/private/mix_library.bzl
@@ -44,7 +44,7 @@ def _mix_library_impl(ctx):
     # should instead return a Provider that can provide erlang...library info?
     # TBD
     # This also needs a better name
-    ebin = ctx.actions.declare_directory("ebin")
+    ebin = ctx.actions.declare_directory(ctx.label.name + "_ebin")
 
     # Create individual priv file symlinks rather than a directory artifact.
     # A directory artifact named "priv" causes path doubling (priv/priv/...)
@@ -210,9 +210,15 @@ cp _output/{mix_env}/lib/{app_name}/ebin/*.beam _output/{mix_env}/lib/{app_name}
         mnemonic = "MIXCOMPILE",
     )
 
+    dep_runfiles = [dep[DefaultInfo].default_runfiles for dep in ctx.attr.deps if DefaultInfo in dep]
+    lib_runfiles = ctx.runfiles(files = [ebin] + priv_files + ctx.files.data)
+    for dr in dep_runfiles:
+        lib_runfiles = lib_runfiles.merge(dr)
+
     return [
         DefaultInfo(
             files = depset([ebin] + priv_files),
+            runfiles = lib_runfiles,
         ),
         MixProjectInfo(
             # app_name = ctx.attr.app_name,
diff --git a/private/mix_test.bzl b/private/mix_test.bzl
index 2258b4f..b33389a 100644
--- a/private/mix_test.bzl
+++ b/private/mix_test.bzl
@@ -88,7 +88,7 @@ DEPS_DIR="$(realpath {erl_libs_dir})"
 # With --no-compile, Mix is read-only — symlinks avoid copying entirely.
 # Mix manages app code paths from _build; no -pa flags needed for deps.
 mkdir -p _build/test/lib/{app_name}
-ln -s "$(realpath ebin)" _build/test/lib/{app_name}/ebin
+ln -s "$(realpath {beam_dir})" _build/test/lib/{app_name}/ebin
 {priv_symlink}
 
 for app_dir in "$DEPS_DIR"/*; do
@@ -116,6 +116,7 @@ MIX_ENV=test \\
         elixir_home = elixir_home,
         package = package,
         app_name = app_name,
+        beam_dir = lib_beam_dirs[0].basename,
         erl_libs_dir = erl_libs_dir,
         priv_symlink = priv_symlink,
         env = env,