diff --git a/poky/scripts/lib/wic/partition.py b/poky/scripts/lib/wic/partition.py
index 3da7e23..ca206ec 100644
--- a/poky/scripts/lib/wic/partition.py
+++ b/poky/scripts/lib/wic/partition.py
@@ -173,7 +173,7 @@
             # Split sourceparams string of the form key1=val1[,key2=val2,...]
             # into a dict.  Also accepts valueless keys i.e. without =
             splitted = self.sourceparams.split(',')
-            srcparams_dict = dict(par.split('=') for par in splitted if par)
+            srcparams_dict = dict(par.split('=', 1) for par in splitted if par)
 
         plugin = PluginMgr.get_plugins('source')[self.source]
         plugin.do_configure_partition(self, srcparams_dict, creator,