diff --git a/openflexure_microscope/plugins/default/autofocus/api.py b/openflexure_microscope/plugins/default/autofocus/api.py
index 7c211051..9b92e5e8 100644
--- a/openflexure_microscope/plugins/default/autofocus/api.py
+++ b/openflexure_microscope/plugins/default/autofocus/api.py
@@ -23,4 +23,4 @@ class AutofocusAPI(MicroscopeViewPlugin):
         task = self.microscope.task.start(self.plugin.autofocus, dz)
 
         # return a handle on the autofocus task
-        return jsonify(task.state, 202)
+        return jsonify(task.state), 202
diff --git a/openflexure_microscope/plugins/default/camera_calibration/plugin.py b/openflexure_microscope/plugins/default/camera_calibration/plugin.py
index 7162d315..ff27a561 100644
--- a/openflexure_microscope/plugins/default/camera_calibration/plugin.py
+++ b/openflexure_microscope/plugins/default/camera_calibration/plugin.py
@@ -18,7 +18,7 @@ class RecalibrateAPIView(MicroscopeViewPlugin):
         task = self.microscope.task.start(self.plugin.recalibrate)
 
         # Return a handle on the autofocus task
-        return jsonify(task.state, 202)
+        return jsonify(task.state), 202
 
 
 class Plugin(MicroscopePlugin):
diff --git a/openflexure_microscope/plugins/default/scan/api.py b/openflexure_microscope/plugins/default/scan/api.py
index ad7fce10..45e514cc 100644
--- a/openflexure_microscope/plugins/default/scan/api.py
+++ b/openflexure_microscope/plugins/default/scan/api.py
@@ -48,7 +48,7 @@ class TileScanAPI(MicroscopeViewPlugin):
         )
 
         # return a handle on the autofocus task
-        return jsonify(task.state, 202)
+        return jsonify(task.state), 202
 
 
 class ZStackAPI(MicroscopeViewPlugin):
@@ -88,4 +88,4 @@ class ZStackAPI(MicroscopeViewPlugin):
         )
 
         # return a handle on the autofocus task
-        return jsonify(task.state, 202)
+        return jsonify(task.state), 202