diff --git a/bitbake/lib/bb/server/process.py b/bitbake/lib/bb/server/process.py
index 28b8eb9b86..80a7875ad9 100644
--- a/bitbake/lib/bb/server/process.py
+++ b/bitbake/lib/bb/server/process.py
@@ -499,6 +499,7 @@ def connectProcessServer(sockname, featureset):
                 except IOError as e:
                     if e.errno == errno.EWOULDBLOCK:
                         pass
+                    raise
         finally:
             os.chdir(cwd)