diff --git a/minifier.py b/minifier.py
index a430d7c..9783330 100755
--- a/minifier.py
+++ b/minifier.py
@@ -19,7 +19,7 @@ def is_group_opening(self):
         def __eq__(self, other):
             if isinstance(other, BashFileIterator._Delimiter):
                 return other.character == self.character
-            elif isinstance(other, basestring):
+            elif isinstance(other, str):
                 return other == self.character
             return False
 
@@ -213,7 +213,7 @@ def close_heredoc():
             self.pos += 1
 
         assert not self.isInsideGroup(), 'Invalid syntax'
-        raise StopIteration
+        # raise StopIteration # XXX I'm not too confident of the purpose of this, but it works without it.
 
     def isEscaped(self):
         return self.pos in self._indices_of_escaped_characters
diff --git a/run_tests.sh b/run_tests.sh
index 7a08616..01f35d9 100755
--- a/run_tests.sh
+++ b/run_tests.sh
@@ -5,7 +5,7 @@ passed=0
 failed=0
 for f in t*.sh; do
     echo -n "$f "
-    python ../minifier.py $f > _tmp_$f
+    python3 ../minifier.py $f > _tmp_$f
     if [ `diff _tmp_$f minified_$f | wc -c` -ne 0 ]; then
         failed=$((failed+1))
         echo FAILED