--- a/testing/mozbase/mozlog/mozlog/formatters/machformatter.py
+++ b/testing/mozbase/mozlog/mozlog/formatters/machformatter.py
@@ -94,22 +94,24 @@ class MachFormatter(base.BaseFormatter):
             if status in ("PASS", "OK"):
                 status = "UNEXPECTED-%s" % status
         return color(status)
 
     def _format_status(self, test, data):
         name = data.get("subtest", test)
         rv = "%s %s" % (self._format_expected(
             data["status"], data.get("expected", data["status"])), name)
-        if 'message' in data:
-            rv += " - %s" % data['message']
+        if "message" in data:
+            rv += " - %s" % data["message"]
+        if "stack" in data:
+            rv += self._format_stack(data["stack"])
+        return rv
 
-        if 'stack' in data:
-            rv += "\n%s\n" % self.term.dim(data['stack'].strip('\n'))
-        return rv
+    def _format_stack(self, stack):
+        return "\n%s\n" % self.term.dim(stack.strip("\n"))
 
     def _format_suite_summary(self, suite, summary):
         count = summary['counts']
         logs = summary['unexpected_logs']
 
         rv = ["", self.term.yellow(suite), self.term.yellow("~" * len(suite))]
 
         # Format check counts
@@ -193,16 +195,18 @@ class MachFormatter(base.BaseFormatter):
             rv = "%s%s" % (data["status"], expected_str)
 
         unexpected = self.summary.current["unexpected_logs"].get(data["test"])
         if unexpected:
             if len(unexpected) == 1 and parent_unexpected:
                 message = unexpected[0].get("message", "")
                 if message:
                     rv += " - %s" % message
+                if "stack" in data:
+                    rv += self._format_stack(data["stack"])
             elif not self.verbose:
                 rv += "\n"
                 for d in unexpected:
                     rv += self._format_status(data['test'], d)
 
         if "expected" not in data and not bool(subtests['unexpected']):
             color = self.term.green
         else: