--- a/layout/inspector/tests/mochitest.ini
+++ b/layout/inspector/tests/mochitest.ini
@@ -31,9 +31,8 @@ support-files =
 fail-if = stylo # bug 1387932
 [test_get_all_style_sheets.html]
 [test_is_valid_css_color.html]
 [test_isinheritableproperty.html]
 [test_parseStyleSheet.html]
 [test_parseStyleSheetImport.html]
 fail-if = stylo # bug 1387933
 [test_selectormatcheselement.html]
-fail-if = stylo # bug 1387934

--- a/layout/style/ServoStyleRule.cpp
+++ b/layout/style/ServoStyleRule.cpp
@@ -7,16 +7,17 @@
 /* representation of CSSStyleRule for stylo */
 
 #include "mozilla/ServoStyleRule.h"
 
 #include "mozilla/DeclarationBlockInlines.h"
 #include "mozilla/ServoBindings.h"
 #include "mozilla/ServoDeclarationBlock.h"
 #include "mozilla/dom/CSSStyleRuleBinding.h"
+#include "nsCSSPseudoClasses.h"
 
 #include "mozAutoDocUpdate.h"
 
 namespace mozilla {
 
 // -- ServoStyleRuleDeclaration ---------------------------------------
 
 ServoStyleRuleDeclaration::ServoStyleRuleDeclaration(
@@ -274,20 +275,27 @@ ServoStyleRule::GetSpecificity(uint32_t 
 }
 
 nsresult
 ServoStyleRule::SelectorMatchesElement(Element* aElement,
                                        uint32_t aSelectorIndex,
                                        const nsAString& aPseudo,
                                        bool* aMatches)
 {
-  nsCOMPtr<nsIAtom> pseudoElt = NS_Atomize(aPseudo);
-  const CSSPseudoElementType pseudoType =
-    nsCSSPseudoElements::GetPseudoType(pseudoElt,
-                                       CSSEnabledState::eIgnoreEnabledState);
-  *aMatches = Servo_StyleRule_SelectorMatchesElement(mRawRule,
-                                                     aElement,
-                                                     aSelectorIndex,
-                                                     pseudoType);
+  CSSPseudoElementType pseudoType = CSSPseudoElementType::NotPseudo;
+  if (!aPseudo.IsEmpty()) {
+    nsCOMPtr<nsIAtom> pseudoElt = NS_Atomize(aPseudo);
+    pseudoType = nsCSSPseudoElements::GetPseudoType(
+        pseudoElt, CSSEnabledState::eIgnoreEnabledState);
+
+    if (pseudoType == CSSPseudoElementType::NotPseudo) {
+      *aMatches = false;
+      return NS_OK;
+    }
+  }
+
+  *aMatches = Servo_StyleRule_SelectorMatchesElement(mRawRule, aElement,
+                                                     aSelectorIndex, pseudoType);
+
   return NS_OK;
 }
 
 } // namespace mozilla