diff --git a/src/execo/process.py b/src/execo/process.py
index 6eff553e779b3fb14b097e10694d3ec351444792..13b1b624b31118bc8e40d2dcfa4e11bf09b97f71 100644
--- a/src/execo/process.py
+++ b/src/execo/process.py
@@ -287,14 +287,16 @@ class ExpectOutputHandler(ProcessOutputHandler):
             elif self.backtrack_size != None:
                 self.last_pos[k] = max(self.last_pos[k], len(streamdata) - len(string) - self.backtrack_size)
             logger.debug("ExpectOuputHandler: scan stream %s at position %s of process %s" % (stream, self.last_pos[k], process))
+            logger.iodebug("ExpectOuputHandler: stream from this position is: %r" % (streamdata[self.last_pos[k]:],))
             for re_index, r in enumerate(self.regexes):
                 mo = r.search(streamdata, self.last_pos[k])
                 if mo != None:
                     self.last_pos[k] = mo.end()
-                    logger.debug("ExpectOuputHandler: match found for %r in stream %s at position %s in %s" % (
+                    logger.debug("ExpectOuputHandler: match found for %r in stream %s at position %s: %r in %s" % (
                         r.pattern,
                         stream,
                         mo.span(),
+                        streamdata[mo.span()[0]:mo.span()[1]],
                         process))
                     break
             if mo == None: re_index = None