diff --git a/blueprintcompiler/interactive_port.py b/blueprintcompiler/interactive_port.py
index 37aef93..0cd9a81 100644
--- a/blueprintcompiler/interactive_port.py
+++ b/blueprintcompiler/interactive_port.py
@@ -77,6 +77,8 @@ porting tool. If you think it's a bug (which is likely), please file an issue on
 def listdir_recursive(subdir):
     files = os.listdir(subdir)
     for file in files:
+        if file in ["_build", "build"]:
+            continue
         full = os.path.join(subdir, file)
         if full == "./subprojects":
             # skip the subprojects directory
diff --git a/tests/samples/.accessibility.blp.swp b/tests/samples/.accessibility.blp.swp
new file mode 100644
index 0000000..18a9e9e
Binary files /dev/null and b/tests/samples/.accessibility.blp.swp differ