diff --git a/layout/html/table/src/BasicTableLayoutStrategy.cpp b/layout/html/table/src/BasicTableLayoutStrategy.cpp
index 9319005ebcfa..3dc01683b31a 100644
--- a/layout/html/table/src/BasicTableLayoutStrategy.cpp
+++ b/layout/html/table/src/BasicTableLayoutStrategy.cpp
@@ -261,7 +261,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalCounts[PCT] > 0) {
     if (totalAllocated + totalAvailWidths[PCT] - minWidths[PCT] <= maxWidth) {
       AllocateFully(totalAllocated, allocTypes, PCT);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, PCT, PR_FALSE, allocTypes);
@@ -272,7 +272,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[FIX] > 0) {
     if (totalAllocated + totalAvailWidths[FIX] - minWidths[FIX] <= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, FIX);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, FIX, PR_TRUE, allocTypes);
@@ -283,7 +283,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[FIX_ADJ] > 0) {
     if (totalAllocated + totalAvailWidths[FIX_ADJ] - minWidths[FIX_ADJ] <= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, FIX_ADJ);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, FIX_ADJ, PR_TRUE, allocTypes);
@@ -294,7 +294,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[MIN_PRO] > 0) {
     if (totalAllocated + totalAvailWidths[MIN_PRO] - minWidths[MIN_PRO] <= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, MIN_PRO, PR_FALSE);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, MIN_PRO, PR_FALSE, allocTypes);
@@ -306,7 +306,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[DES_CON] > 0) {
     if (totalAllocated + totalAvailWidths[DES_CON] - minWidths[DES_CON]<= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, DES_CON);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, DES_CON, PR_FALSE, allocTypes);
diff --git a/layout/tables/BasicTableLayoutStrategy.cpp b/layout/tables/BasicTableLayoutStrategy.cpp
index 9319005ebcfa..3dc01683b31a 100644
--- a/layout/tables/BasicTableLayoutStrategy.cpp
+++ b/layout/tables/BasicTableLayoutStrategy.cpp
@@ -261,7 +261,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalCounts[PCT] > 0) {
     if (totalAllocated + totalAvailWidths[PCT] - minWidths[PCT] <= maxWidth) {
       AllocateFully(totalAllocated, allocTypes, PCT);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, PCT, PR_FALSE, allocTypes);
@@ -272,7 +272,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[FIX] > 0) {
     if (totalAllocated + totalAvailWidths[FIX] - minWidths[FIX] <= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, FIX);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, FIX, PR_TRUE, allocTypes);
@@ -283,7 +283,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[FIX_ADJ] > 0) {
     if (totalAllocated + totalAvailWidths[FIX_ADJ] - minWidths[FIX_ADJ] <= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, FIX_ADJ);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, FIX_ADJ, PR_TRUE, allocTypes);
@@ -294,7 +294,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[MIN_PRO] > 0) {
     if (totalAllocated + totalAvailWidths[MIN_PRO] - minWidths[MIN_PRO] <= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, MIN_PRO, PR_FALSE);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, MIN_PRO, PR_FALSE, allocTypes);
@@ -306,7 +306,7 @@ BasicTableLayoutStrategy::BalanceColumnWidths(nsIStyleContext*         aTableSty
   if (totalAllocated < maxWidth && totalCounts[DES_CON] > 0) {
     if (totalAllocated + totalAvailWidths[DES_CON] - minWidths[DES_CON]<= maxWidth) { 
       AllocateFully(totalAllocated, allocTypes, DES_CON);
-      NS_ASSERTION(totalAllocated <= maxWidth, "over allocated");
+      NS_WARN_IF_FALSE(totalAllocated <= maxWidth, "over allocated");
     }
     else {
       AllocateConstrained(maxWidth - totalAllocated, DES_CON, PR_FALSE, allocTypes);