diff --git a/poky/meta/lib/oeqa/sdkext/testsdk.py b/poky/meta/lib/oeqa/sdkext/testsdk.py
index c5c46df..ffd185e 100644
--- a/poky/meta/lib/oeqa/sdkext/testsdk.py
+++ b/poky/meta/lib/oeqa/sdkext/testsdk.py
@@ -99,6 +99,9 @@
             if not result.wasSuccessful():
                 fail = True
 
+            # Clean the workspace/sources to avoid `devtool add' failure because of non-empty source directory
+            bb.utils.remove(sdk_dir+'workspace/sources', True)
+
         if fail:
             bb.fatal("%s - FAILED - check the task log and the commands log" % pn)