diff --git a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/inheritance/AbstractMethodWithMissingImplementationsInspection.java b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/inheritance/AbstractMethodWithMissingImplementationsInspection.java
index d6c0d6721b29..c79c3c0b84ae 100644
--- a/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/inheritance/AbstractMethodWithMissingImplementationsInspection.java
+++ b/plugins/InspectionGadgets/InspectionGadgetsAnalysis/src/com/siyeh/ig/inheritance/AbstractMethodWithMissingImplementationsInspection.java
@@ -1,5 +1,5 @@
 /*
- * Copyright 2003-2015 Dave Griffith, Bas Leijdekkers
+ * Copyright 2003-2018 Dave Griffith, Bas Leijdekkers
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -61,17 +61,13 @@ public class AbstractMethodWithMissingImplementationsInspection
     @Override
     public void visitMethod(PsiMethod method) {
       super.visitMethod(method);
-      if (method.getNameIdentifier() == null) {
+      if (method.getNameIdentifier() == null || !method.hasModifierProperty(PsiModifier.ABSTRACT)) {
         return;
       }
       final PsiClass containingClass = method.getContainingClass();
       if (containingClass == null) {
         return;
       }
-      if (!containingClass.isInterface() ||
-          !method.hasModifierProperty(PsiModifier.ABSTRACT)) {
-        return;
-      }
       final InheritorFinder inheritorFinder = new InheritorFinder(containingClass);
       for (final PsiClass inheritor : inheritorFinder.getInheritors()) {
         if (hasMatchingImplementation(inheritor, method, containingClass)) {
diff --git a/plugins/InspectionGadgets/test/com/siyeh/igtest/inheritance/abstract_method_with_missing_implementations/AbstractMethodWithMissingImplementations.java b/plugins/InspectionGadgets/test/com/siyeh/igtest/inheritance/abstract_method_with_missing_implementations/AbstractMethodWithMissingImplementations.java
index 1e9da29d6b6b..dd60929d0f4b 100644
--- a/plugins/InspectionGadgets/test/com/siyeh/igtest/inheritance/abstract_method_with_missing_implementations/AbstractMethodWithMissingImplementations.java
+++ b/plugins/InspectionGadgets/test/com/siyeh/igtest/inheritance/abstract_method_with_missing_implementations/AbstractMethodWithMissingImplementations.java
@@ -55,4 +55,10 @@ interface I2 {
 }
 <error descr="Class 'E2' must either be declared abstract or implement abstract method 'method()' in 'I2'">enum E2 implements I2</error> {
   A
+}
+abstract class Perspicacious {
+
+  abstract void <warning descr="Abstract method 'insightAndUnderstanding()' is not implemented in every subclass">insightAndUnderstanding</warning>();
+}
+<error descr="Class 'HighlyPerspicacious' must either be declared abstract or implement abstract method 'insightAndUnderstanding()' in 'Perspicacious'">class HighlyPerspicacious extends Perspicacious</error> {
 }
\ No newline at end of file