diff --git a/content/base/src/nsStyleSet.cpp b/content/base/src/nsStyleSet.cpp
index 5b517412c9d..85a4714091d 100644
--- a/content/base/src/nsStyleSet.cpp
+++ b/content/base/src/nsStyleSet.cpp
@@ -687,6 +687,7 @@ nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
                                                    nsIStyleContext* aParentContext,
                                                    PRBool aForceUnique)
 {
+  NS_START_STOPWATCH(mStyleResolutionWatch)
   nsIStyleContext*  result = nsnull;
 
   NS_ASSERTION(aPseudoTag, "must have pseudo tag");
@@ -737,6 +738,7 @@ nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
     }
   }
 
+  NS_STOP_STOPWATCH(mStyleResolutionWatch)
   return result;
 }
 
diff --git a/layout/base/src/nsStyleSet.cpp b/layout/base/src/nsStyleSet.cpp
index 5b517412c9d..85a4714091d 100644
--- a/layout/base/src/nsStyleSet.cpp
+++ b/layout/base/src/nsStyleSet.cpp
@@ -687,6 +687,7 @@ nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
                                                    nsIStyleContext* aParentContext,
                                                    PRBool aForceUnique)
 {
+  NS_START_STOPWATCH(mStyleResolutionWatch)
   nsIStyleContext*  result = nsnull;
 
   NS_ASSERTION(aPseudoTag, "must have pseudo tag");
@@ -737,6 +738,7 @@ nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
     }
   }
 
+  NS_STOP_STOPWATCH(mStyleResolutionWatch)
   return result;
 }
 
diff --git a/layout/style/nsStyleSet.cpp b/layout/style/nsStyleSet.cpp
index 5b517412c9d..85a4714091d 100644
--- a/layout/style/nsStyleSet.cpp
+++ b/layout/style/nsStyleSet.cpp
@@ -687,6 +687,7 @@ nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
                                                    nsIStyleContext* aParentContext,
                                                    PRBool aForceUnique)
 {
+  NS_START_STOPWATCH(mStyleResolutionWatch)
   nsIStyleContext*  result = nsnull;
 
   NS_ASSERTION(aPseudoTag, "must have pseudo tag");
@@ -737,6 +738,7 @@ nsIStyleContext* StyleSetImpl::ProbePseudoStyleFor(nsIPresContext* aPresContext,
     }
   }
 
+  NS_STOP_STOPWATCH(mStyleResolutionWatch)
   return result;
 }