diff --git a/platformio/__init__.py b/platformio/__init__.py
index c6e11380..934d4304 100644
--- a/platformio/__init__.py
+++ b/platformio/__init__.py
@@ -14,7 +14,7 @@
 
 import sys
 
-VERSION = (3, 0, "0a8")
+VERSION = (3, 0, "0a9")
 __version__ = ".".join([str(s) for s in VERSION])
 
 __title__ = "platformio"
diff --git a/platformio/builder/tools/piolib.py b/platformio/builder/tools/piolib.py
index 01f73d20..1e820327 100644
--- a/platformio/builder/tools/piolib.py
+++ b/platformio/builder/tools/piolib.py
@@ -131,7 +131,7 @@ class LibBuilderBase(object):  # pylint: disable=too-many-instance-attributes
 
     @property
     def build_dir(self):
-        return join("$BUILD_DIR", "lib", self.name)
+        return join("$BUILD_DIR", "lib", basename(self.path))
 
     def get_inc_dirs(self, use_build_dir=False):
         return [self.build_dir if use_build_dir else self.src_dir]