diff --git a/cython/setup.py.in b/cython/setup.py.in
index 0c37cd660..b7b0b7bc5 100644
--- a/cython/setup.py.in
+++ b/cython/setup.py.in
@@ -9,7 +9,7 @@ except ImportError:
 script_path = os.path.abspath(os.path.realpath(__file__))
 install_path = os.path.abspath(os.path.realpath(os.path.join('${GTSAM_CYTHON_INSTALL_PATH}', 'setup.py')))
 if script_path != install_path:
-    print('setup.py is being run from an unexpected location: "{script_path}"')
+    print('setup.py is being run from an unexpected location: "{}"'.format(script_path))
     print('please run `make install` and run the script from there')
     sys.exit(1)