diff --git a/java/java-analysis-impl/src/com/intellij/codeInspection/java15api/Java15APIUsageInspectionBase.java b/java/java-analysis-impl/src/com/intellij/codeInspection/java15api/Java15APIUsageInspectionBase.java
index 1d9fd85aeee0..23d06e180dec 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInspection/java15api/Java15APIUsageInspectionBase.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInspection/java15api/Java15APIUsageInspectionBase.java
@@ -154,11 +154,6 @@ public class Java15APIUsageInspectionBase extends BaseJavaBatchLocalInspectionTo
     return HighlightDisplayLevel.ERROR;
   }
 
-  @Override
-  public boolean isEnabledByDefault() {
-    return false;
-  }
-
   @Override
   public void readSettings(@NotNull Element node) throws InvalidDataException {
     final Element element = node.getChild(EFFECTIVE_LL);
diff --git a/platform/platform-resources-en/src/messages/InspectionsBundle.properties b/platform/platform-resources-en/src/messages/InspectionsBundle.properties
index 82fee6528344..2f02473b8492 100644
--- a/platform/platform-resources-en/src/messages/InspectionsBundle.properties
+++ b/platform/platform-resources-en/src/messages/InspectionsBundle.properties
@@ -120,7 +120,7 @@ inspection.equals.hashcode.only.one.defined.problem.descriptor=Class has {0} def
 inspection.equals.hashcode.generate.equals.quickfix=Generate 'equals()'
 inspection.equals.hashcode.generate.hashcode.quickfix=Generate 'hashCode()'
 
-inspection.1.5.display.name=Usages of API documented as @since 1.5 (1.6|1.7)
+inspection.1.5.display.name=Usages of API which isn't available at the configured language level
 inspection.1.5.problem.descriptor=Usage of API documented as @since {0}+
 inspection.1.7.problem.descriptor=Usage of generified after 1.6 API which would cause compilation problems with JDK {0}
 inspection.1.8.problem.descriptor=Default {0, choice, 0#|1#method is|2# methods are} not overridden. It would cause compilation problems with JDK {1}
diff --git a/resources/src/META-INF/IdeaPlugin.xml b/resources/src/META-INF/IdeaPlugin.xml
index 309d77b23b1c..8c0009d4fb70 100644
--- a/resources/src/META-INF/IdeaPlugin.xml
+++ b/resources/src/META-INF/IdeaPlugin.xml
@@ -635,7 +635,7 @@
                      groupName="Probable bugs" enabledByDefault="false" level="WARNING"
                      implementationClass="com.intellij.codeInspection.equalsAndHashcode.EqualsAndHashcode"/>
     <localInspection groupPath="Java" language="JAVA" shortName="Since15" bundle="messages.InspectionsBundle" key="inspection.1.5.display.name"
-                     groupName="Java language level migration aids" enabledByDefault="false" level="ERROR"
+                     groupName="Java language level migration aids" enabledByDefault="true" level="ERROR"
                      implementationClass="com.intellij.codeInspection.java15api.Java15APIUsageInspection"/>
     <localInspection groupPath="Java" language="JAVA" shortName="Dependency" displayName="Illegal package dependencies" groupName="Dependency issues" enabledByDefault="true" level="ERROR"
                      implementationClass="com.intellij.codeInspection.dependencyViolation.DependencyInspection"/>