diff --git a/pisi/zipfileext.py b/pisi/zipfileext.py
index 168c790d..38f22d0f 100644
--- a/pisi/zipfileext.py
+++ b/pisi/zipfileext.py
@@ -67,6 +67,7 @@ class ZipFileEntry:
             result.append(self.decompress(compr_data))
             self.buffer = ""
             self.finished = 1
+            result = "".join(result)
             self.returnedBytes += len(result)
             return result
         else: