diff --git a/content/base/src/nsDocument.cpp b/content/base/src/nsDocument.cpp
index e20494e15ab..b711969d582 100644
--- a/content/base/src/nsDocument.cpp
+++ b/content/base/src/nsDocument.cpp
@@ -1290,7 +1290,6 @@ void nsDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
 {
   NS_PRECONDITION(nsnull != aSheet, "null arg");
   mStyleSheets.RemoveElement(aSheet);
-  NS_RELEASE(aSheet);
   
   PRBool enabled = PR_TRUE;
   aSheet->GetEnabled(enabled);
@@ -1317,6 +1316,9 @@ void nsDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
       }
     }
   }
+
+  aSheet->SetOwningDocument(nsnull);
+  NS_RELEASE(aSheet);
 }
 
 void 
diff --git a/content/xul/document/src/nsXULDocument.cpp b/content/xul/document/src/nsXULDocument.cpp
index 0f17f405796..235aa166aa5 100644
--- a/content/xul/document/src/nsXULDocument.cpp
+++ b/content/xul/document/src/nsXULDocument.cpp
@@ -1012,7 +1012,6 @@ nsXULDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
 {
   NS_PRECONDITION(nsnull != aSheet, "null arg");
   mStyleSheets.RemoveElement(aSheet);
-  NS_RELEASE(aSheet);
   
   PRBool enabled = PR_TRUE;
   aSheet->GetEnabled(enabled);
@@ -1039,6 +1038,9 @@ nsXULDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
       }
     }
   }
+
+  aSheet->SetOwningDocument(nsnull);
+  NS_RELEASE(aSheet);
 }
 
 NS_IMETHODIMP
diff --git a/layout/base/src/nsDocument.cpp b/layout/base/src/nsDocument.cpp
index e20494e15ab..b711969d582 100644
--- a/layout/base/src/nsDocument.cpp
+++ b/layout/base/src/nsDocument.cpp
@@ -1290,7 +1290,6 @@ void nsDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
 {
   NS_PRECONDITION(nsnull != aSheet, "null arg");
   mStyleSheets.RemoveElement(aSheet);
-  NS_RELEASE(aSheet);
   
   PRBool enabled = PR_TRUE;
   aSheet->GetEnabled(enabled);
@@ -1317,6 +1316,9 @@ void nsDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
       }
     }
   }
+
+  aSheet->SetOwningDocument(nsnull);
+  NS_RELEASE(aSheet);
 }
 
 void 
diff --git a/rdf/content/src/nsXULDocument.cpp b/rdf/content/src/nsXULDocument.cpp
index 0f17f405796..235aa166aa5 100644
--- a/rdf/content/src/nsXULDocument.cpp
+++ b/rdf/content/src/nsXULDocument.cpp
@@ -1012,7 +1012,6 @@ nsXULDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
 {
   NS_PRECONDITION(nsnull != aSheet, "null arg");
   mStyleSheets.RemoveElement(aSheet);
-  NS_RELEASE(aSheet);
   
   PRBool enabled = PR_TRUE;
   aSheet->GetEnabled(enabled);
@@ -1039,6 +1038,9 @@ nsXULDocument::RemoveStyleSheet(nsIStyleSheet* aSheet)
       }
     }
   }
+
+  aSheet->SetOwningDocument(nsnull);
+  NS_RELEASE(aSheet);
 }
 
 NS_IMETHODIMP