diff --git a/hist/hist/src/TH2Poly.cxx b/hist/hist/src/TH2Poly.cxx
index dfb17ef15d186460602afcbfb54ebebbf4e02e38..5bbd85d31caf2eb848281fe5f7007e7267bffcca 100644
--- a/hist/hist/src/TH2Poly.cxx
+++ b/hist/hist/src/TH2Poly.cxx
@@ -1081,6 +1081,8 @@ TH2PolyBin::TH2PolyBin()
    fXmin    = -1111;
    fYmax    = -1111;
    fYmin    = -1111;
+   fArea    = 0;
+   SetChanged(kTRUE);
 }