diff --git a/dom/xslt/xslt/txMozillaXSLTProcessor.cpp b/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
index 0df80716c1..867bc53392 100644
--- a/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
+++ b/dom/xslt/xslt/txMozillaXSLTProcessor.cpp
@@ -604,6 +604,9 @@ txMozillaXSLTProcessor::ImportStylesheet(nsIDOMNode *aStyle)
     NS_ENSURE_TRUE(!mStylesheetDocument && !mStylesheet,
                    NS_ERROR_NOT_IMPLEMENTED);
 
+    // Reset mCompileResult when importing.
+    mCompileResult = NS_OK;
+
     nsCOMPtr<nsINode> node = do_QueryInterface(aStyle);
     if (!node || !nsContentUtils::SubjectPrincipalOrSystemIfNativeCaller()->Subsumes(node->NodePrincipal())) {
         return NS_ERROR_DOM_SECURITY_ERR;