diff --git a/java/java-tests/testSrc/com/intellij/codeInspection/ex/InspectionProfileTest.java b/java/java-tests/testSrc/com/intellij/codeInspection/ex/InspectionProfileTest.java
index 027d400fccd6..bc6c6c798411 100644
--- a/java/java-tests/testSrc/com/intellij/codeInspection/ex/InspectionProfileTest.java
+++ b/java/java-tests/testSrc/com/intellij/codeInspection/ex/InspectionProfileTest.java
@@ -462,6 +462,35 @@ public class InspectionProfileTest extends LightIdeaTestCase {
     assertThat(importedProfile.writeScheme()).isEqualTo(mergedElement);
   }
 
+  public void testKeepUnloadedMergeNamingConventions() throws Exception {
+      String unchanged = "<profile version=\"1.0\">\n" +
+                         "  <option name=\"myName\" value=\"ToConvert\" />\n" +
+                         "  <inspection_tool class=\"NewClassNamingConvention\" enabled=\"true\" level=\"WARNING\" enabled_by_default=\"true\">\n" +
+                         "    <extension name=\"AnnotationNamingConvention\" enabled=\"true\">\n" +
+                         "      <option name=\"inheritDefaultSettings\" value=\"false\" />\n" +
+                         "      <option name=\"m_regex\" value=\"[A-Z][A-Za-z\\d]*\" />\n" +
+                         "      <option name=\"m_minLength\" value=\"8\" />\n" +
+                         "      <option name=\"m_maxLength\" value=\"66\" />\n" +
+                         "    </extension>\n" +
+                         "    <extension name=\"AnnotationNamingConventionUnknown\" enabled=\"true\">\n" +
+                         "      <option name=\"m_regex\" value=\"[A-Z][A-Za-z\\d]*\" />\n" +
+                         "      <option name=\"m_minLength\" value=\"8\" />\n" +
+                         "      <option name=\"m_maxLength\" value=\"66\" />\n" +
+                         "    </extension>\n" +
+                         "    <extension name=\"ClassNamingConvention\" enabled=\"true\">\n" +
+                         "      <option name=\"m_regex\" value=\"[A-Z][A-Za-z\\d]*\" />\n" +
+                         "      <option name=\"m_minLength\" value=\"8\" />\n" +
+                         "      <option name=\"m_maxLength\" value=\"66\" />\n" +
+                         "    </extension>\n" +
+                         "  </inspection_tool>\n" +
+                         "</profile>";
+      final Element allEnabledProfile = JdomKt.loadElement(unchanged);
+      InspectionProfileImpl profile = createProfile(new InspectionProfileImpl("foo"));
+      profile.readExternal(allEnabledProfile);
+      profile.initInspectionTools();
+      assertEquals(unchanged, serialize(profile));
+    }
+
   public void testMergeMethodNamingConventions() throws Exception {
     final Element element = JdomKt.loadElement("<profile version=\"1.0\">\n" +
                                                "  <option name=\"myName\" value=\"" + PROFILE + "\" />\n" +
diff --git a/platform/lang-impl/src/com/intellij/codeInspection/naming/AbstractNamingConventionInspection.java b/platform/lang-impl/src/com/intellij/codeInspection/naming/AbstractNamingConventionInspection.java
index d489951b232d..c36838e99b4a 100644
--- a/platform/lang-impl/src/com/intellij/codeInspection/naming/AbstractNamingConventionInspection.java
+++ b/platform/lang-impl/src/com/intellij/codeInspection/naming/AbstractNamingConventionInspection.java
@@ -40,6 +40,7 @@ public abstract class AbstractNamingConventionInspection<T extends PsiNameIdenti
 
   private final Map<String, NamingConvention<T>> myNamingConventions = new LinkedHashMap<>();
   private final Map<String, NamingConventionBean> myNamingConventionBeans = new LinkedHashMap<>();
+  private final Map<String, Element> myUnloadedElements = new LinkedHashMap<>();
   private final Set<String> myDisabledShortNames = new HashSet<>();
   @Nullable private final String myDefaultConventionShortName;
 
@@ -88,6 +89,10 @@ public abstract class AbstractNamingConventionInspection<T extends PsiNameIdenti
       String shortName = extension.getAttributeValue("name");
       if (shortName == null) continue;
       NamingConventionBean conventionBean = myNamingConventionBeans.get(shortName);
+      if (conventionBean == null) {
+        myUnloadedElements.put(shortName, extension);
+        continue;
+      }
       try {
         XmlSerializer.deserializeInto(conventionBean, extension);
         conventionBean.initPattern();
@@ -104,8 +109,15 @@ public abstract class AbstractNamingConventionInspection<T extends PsiNameIdenti
 
   @Override
   public void writeSettings(@NotNull Element node) {
-    for (NamingConvention<T> convention : myNamingConventions.values()) {
-      String shortName = convention.getShortName();
+    Set<String> shortNames = new TreeSet<>(myNamingConventions.keySet());
+    shortNames.addAll(myUnloadedElements.keySet());
+    for (String shortName : shortNames) {
+      NamingConvention<T> convention = myNamingConventions.get(shortName);
+      if (convention == null) {
+        Element element = myUnloadedElements.get(shortName);
+        if (element != null) node.addContent(element.clone());
+        continue;
+      }
       boolean disabled = myDisabledShortNames.contains(shortName);
       Element element = new Element("extension")
         .setAttribute("name", shortName)