diff --git a/src/octoprint/server/api/files.py b/src/octoprint/server/api/files.py
index d7f8f25f..5cd9dede 100644
--- a/src/octoprint/server/api/files.py
+++ b/src/octoprint/server/api/files.py
@@ -29,7 +29,7 @@ import threading
 _file_cache = dict()
 _file_cache_mutex = threading.RLock()
 
-_FILES_DATA_VERSION = 1
+_DATA_FORMAT_VERSION = "v2"
 
 def _clear_file_cache():
 	with _file_cache_mutex:
@@ -73,7 +73,6 @@ def _create_etag(path, filter, recursive, lm=None):
 		return None
 
 	hash = hashlib.sha1()
-	hash.update(str(_FILES_DATA_VERSION))
 	hash.update(str(lm))
 	hash.update(str(filter))
 	hash.update(str(recursive))
@@ -82,6 +81,8 @@ def _create_etag(path, filter, recursive, lm=None):
 		# include sd data in etag
 		hash.update(repr(sorted(printer.get_sd_files(), key=lambda x: x[0])))
 
+	hash.update(_DATA_FORMAT_VERSION) # increment version if we change the API format
+
 	return hash.hexdigest()
 
 
diff --git a/src/octoprint/server/api/slicing.py b/src/octoprint/server/api/slicing.py
index 3427bb3b..5c96008d 100644
--- a/src/octoprint/server/api/slicing.py
+++ b/src/octoprint/server/api/slicing.py
@@ -17,6 +17,9 @@ from octoprint.settings import settings as s, valid_boolean_trues
 from octoprint.slicing import UnknownSlicer, SlicerNotConfigured, ProfileAlreadyExists, UnknownProfile, CouldNotDeleteProfile
 
 
+_DATA_FORMAT_VERSION = "v2"
+
+
 def _lastmodified(configured):
 	if configured:
 		slicers = slicingManager.configured_slicers
@@ -39,11 +42,19 @@ def _etag(configured, lm=None):
 	hash.update(str(lm))
 
 	if configured:
-		hash.update(repr(sorted(slicingManager.configured_slicers)))
+		slicers = slicingManager.configured_slicers
 	else:
-		hash.update(repr(sorted(slicingManager.registered_slicers)))
+		slicers = slicingManager.registered_slicers
 
-	hash.update("v2") # increment version if we change the API format
+	default_slicer = s().get(["slicing", "defaultSlicer"])
+
+	for slicer in sorted(slicers):
+		slicer_impl = slicingManager.get_slicer(slicer, require_configured=False)
+		hash.update(slicer)
+		hash.update(str(slicer_impl.is_slicer_configured()))
+		hash.update(str(slicer == default_slicer))
+	
+	hash.update(_DATA_FORMAT_VERSION) # increment version if we change the API format
 
 	return hash.hexdigest()