diff --git a/CondFormats/Common/interface/FileBlob.h b/CondFormats/Common/interface/FileBlob.h
index 460eb0b866f9f..88d234b1a1bd2 100644
--- a/CondFormats/Common/interface/FileBlob.h
+++ b/CondFormats/Common/interface/FileBlob.h
@@ -9,7 +9,10 @@
 
 class FileBlob {
 public:
-  FileBlob(){};
+  FileBlob() {
+    compressed = false;
+    isize = 0;
+  };
   /// constructor from file to read
   FileBlob(const std::string &fname, bool zip);
   /// constructor from  stream to read