diff --git a/blueoil/cmd/convert.py b/blueoil/cmd/convert.py
index f746afb10..54fb4a2af 100644
--- a/blueoil/cmd/convert.py
+++ b/blueoil/cmd/convert.py
@@ -113,6 +113,7 @@ def make_all(project_dir, output_dir):
         ["ar_fpga", "libdlk_fpga.a"],
         ["ar_aarch64", "libdlk_aarch64.a"],
     ]
+    output_dir = os.path.abspath(output_dir)
     running_dir = os.getcwd()
     # Change current directory to project directory
     os.chdir(project_dir)