diff -up mozilla-release-c61f5f5ead48c78a80c80db5c489bdc7cfaf8175/python/mozbuild/mozbuild/mozconfig.py.mozconfig-fix mozilla-release-c61f5f5ead48c78a80c80db5c489bdc7cfaf8175/python/mozbuild/mozbuild/mozconfig.py
--- mozilla-release-c61f5f5ead48c78a80c80db5c489bdc7cfaf8175/python/mozbuild/mozbuild/mozconfig.py.mozconfig-fix	2018-03-13 17:22:19.018466884 +0100
+++ mozilla-release-c61f5f5ead48c78a80c80db5c489bdc7cfaf8175/python/mozbuild/mozbuild/mozconfig.py	2018-03-13 17:23:57.379559640 +0100
@@ -446,7 +446,7 @@ class MozconfigLoader(object):
                             value = value[1:]
 
                         # Lines with a quote not ending in a quote are multi-line.
-                        if has_quote and not value.endswith("'"):
+                        if has_quote and not value.endswith(("'", ";")):
                             in_variable = name
                             current.append(value)
                             continue