diff --git a/mozilla/layout/html/table/src/BasicTableLayoutStrategy.cpp b/mozilla/layout/html/table/src/BasicTableLayoutStrategy.cpp
index 6dc0deba402..c25cb12d925 100644
--- a/mozilla/layout/html/table/src/BasicTableLayoutStrategy.cpp
+++ b/mozilla/layout/html/table/src/BasicTableLayoutStrategy.cpp
@@ -1139,6 +1139,7 @@ void BasicTableLayoutStrategy::AllocateConstrained(PRInt32  aAvailWidth,
   if (!colInfo) { 
     return;
   }
+  memset(colInfo, 0, aNumConstrainedCols * sizeof(nsColInfo *));
   PRInt32 maxMinDiff = 0;
   PRInt32 constrColX = 0;
   // set the col info entries for each constrained col
diff --git a/mozilla/layout/tables/BasicTableLayoutStrategy.cpp b/mozilla/layout/tables/BasicTableLayoutStrategy.cpp
index 6dc0deba402..c25cb12d925 100644
--- a/mozilla/layout/tables/BasicTableLayoutStrategy.cpp
+++ b/mozilla/layout/tables/BasicTableLayoutStrategy.cpp
@@ -1139,6 +1139,7 @@ void BasicTableLayoutStrategy::AllocateConstrained(PRInt32  aAvailWidth,
   if (!colInfo) { 
     return;
   }
+  memset(colInfo, 0, aNumConstrainedCols * sizeof(nsColInfo *));
   PRInt32 maxMinDiff = 0;
   PRInt32 constrColX = 0;
   // set the col info entries for each constrained col