diff --git a/layout/html/table/src/nsCellMap.cpp b/layout/html/table/src/nsCellMap.cpp
index 99a7b3ca372c..f782abc281f3 100644
--- a/layout/html/table/src/nsCellMap.cpp
+++ b/layout/html/table/src/nsCellMap.cpp
@@ -173,7 +173,7 @@ nsTableColFrame* nsCellMap::GetColumnFrame(PRInt32 aColIndex) const
 void nsCellMap::SetMinColSpan(PRInt32 aColIndex, PRBool aColSpan)
 {
   NS_ASSERTION(aColIndex<mColCount, "bad aColIndex");
-  NS_ASSERTION(aColSpan>=0, "bad aColSpan");
+  NS_ASSERTION(aColSpan>=1, "bad aColSpan");
 
   // initialize the data structure if not already done
   if (nsnull==mMinColSpans)
diff --git a/layout/html/table/src/nsTableFrame.cpp b/layout/html/table/src/nsTableFrame.cpp
index 1088d407c70b..79231610418f 100644
--- a/layout/html/table/src/nsTableFrame.cpp
+++ b/layout/html/table/src/nsTableFrame.cpp
@@ -772,7 +772,7 @@ void nsTableFrame::SetMinColSpanForTable()
           minColSpan = PR_MIN(minColSpan, colSpan);
       }
     }
-    if (1!=minColSpan)
+    if (1<minColSpan)
       mCellMap->SetMinColSpan(colIndex, minColSpan);
   }
 }
diff --git a/layout/tables/nsCellMap.cpp b/layout/tables/nsCellMap.cpp
index 99a7b3ca372c..f782abc281f3 100644
--- a/layout/tables/nsCellMap.cpp
+++ b/layout/tables/nsCellMap.cpp
@@ -173,7 +173,7 @@ nsTableColFrame* nsCellMap::GetColumnFrame(PRInt32 aColIndex) const
 void nsCellMap::SetMinColSpan(PRInt32 aColIndex, PRBool aColSpan)
 {
   NS_ASSERTION(aColIndex<mColCount, "bad aColIndex");
-  NS_ASSERTION(aColSpan>=0, "bad aColSpan");
+  NS_ASSERTION(aColSpan>=1, "bad aColSpan");
 
   // initialize the data structure if not already done
   if (nsnull==mMinColSpans)
diff --git a/layout/tables/nsTableFrame.cpp b/layout/tables/nsTableFrame.cpp
index 1088d407c70b..79231610418f 100644
--- a/layout/tables/nsTableFrame.cpp
+++ b/layout/tables/nsTableFrame.cpp
@@ -772,7 +772,7 @@ void nsTableFrame::SetMinColSpanForTable()
           minColSpan = PR_MIN(minColSpan, colSpan);
       }
     }
-    if (1!=minColSpan)
+    if (1<minColSpan)
       mCellMap->SetMinColSpan(colIndex, minColSpan);
   }
 }