diff --git a/platformio/builder/tools/pioide.py b/platformio/builder/tools/pioide.py
index 8248c06a..37cd55f0 100644
--- a/platformio/builder/tools/pioide.py
+++ b/platformio/builder/tools/pioide.py
@@ -59,7 +59,7 @@ def _dump_includes(env):
             includes["toolchain"].extend([os.path.realpath(inc) for inc in glob(g)])
 
     includes["unity"] = []
-    unity_dir = get_core_package_dir("tool-unity")
+    unity_dir = get_core_package_dir("tool-unity", auto_install=False)
     if unity_dir:
         includes["unity"].append(unity_dir)
 
diff --git a/platformio/package/manager/core.py b/platformio/package/manager/core.py
index a324beb4..f31a8767 100644
--- a/platformio/package/manager/core.py
+++ b/platformio/package/manager/core.py
@@ -27,7 +27,7 @@ from platformio.package.meta import PackageItem, PackageSpec
 from platformio.proc import get_pythonexe_path
 
 
-def get_core_package_dir(name):
+def get_core_package_dir(name, auto_install=True):
     if name not in __core_packages__:
         raise exception.PlatformioException("Please upgrade PlatformIO Core")
     pm = ToolPackageManager()
@@ -37,6 +37,8 @@ def get_core_package_dir(name):
     pkg = pm.get_package(spec)
     if pkg:
         return pkg.path
+    if not auto_install:
+        return None
     assert pm.install(spec)
     _remove_unnecessary_packages()
     return pm.get_package(spec).path