diff --git a/k4ever/api2/decorators.py b/k4ever/api2/decorators.py
index b729f20..a124f05 100644
--- a/k4ever/api2/decorators.py
+++ b/k4ever/api2/decorators.py
@@ -85,3 +85,14 @@ def requirePlugin(apiFunc):
 		return ret
 	return wrapper
 
+def fix_mime(mime_func):
+	""" Fix mimetype by truncating everything behind a ';'. 
+	
+	This is used to fix pistons ``piston.utils.Mimer.loader_for_type``."""
+	@wraps(mime_func)
+	def wrapper(self, ctype):
+		if ctype and ctype.find(";") >= 0:
+			ctype = ctype.split(";")[0]
+		return mime_func(self, ctype)
+	return wrapper
+
diff --git a/k4ever/api2/urls.py b/k4ever/api2/urls.py
index 600d69e..ae60471 100644
--- a/k4ever/api2/urls.py
+++ b/k4ever/api2/urls.py
@@ -3,6 +3,11 @@ from piston.resource import Resource
 from piston.authentication import HttpBasicAuthentication
 from api2.authentication import DjangoAuthentication, MultiAuthentication
 from api2.handlers import *
+from api2.decorators import fix_mime
+import piston.utils
+
+# piston does not understand mimetypes with charsets, HACK: fix loader_for_type
+piston.utils.Mimer.loader_for_type = fix_mime(piston.utils.Mimer.loader_for_type)
 
 class CsrfExemptResource( Resource ):
 	""" Except a :class:`Resource` from djangos CSRF-Framework.