diff --git a/platform/external-system-api/external-system-api.iml b/platform/external-system-api/external-system-api.iml
index 7201f259b96c..af4b5ddc7705 100644
--- a/platform/external-system-api/external-system-api.iml
+++ b/platform/external-system-api/external-system-api.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
@@ -14,5 +14,4 @@
     <orderEntry type="module" module-name="platform-api" />
     <orderEntry type="module" module-name="lang-api" />
   </component>
-</module>
-
+</module>
\ No newline at end of file
diff --git a/plugins/gradle/gradle.iml b/plugins/gradle/gradle.iml
index 77f5624e5375..9abc6287f40f 100644
--- a/plugins/gradle/gradle.iml
+++ b/plugins/gradle/gradle.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
@@ -116,5 +116,4 @@
     <orderEntry type="library" name="Ant" level="project" />
     <orderEntry type="library" name="gson" level="project" />
   </component>
-</module>
-
+</module>
\ No newline at end of file
diff --git a/plugins/gradle/tooling-extension-api/gradle-tooling-extension-api.iml b/plugins/gradle/tooling-extension-api/gradle-tooling-extension-api.iml
index 3e8be5a2dfcd..8b54d7ce3c93 100644
--- a/plugins/gradle/tooling-extension-api/gradle-tooling-extension-api.iml
+++ b/plugins/gradle/tooling-extension-api/gradle-tooling-extension-api.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
@@ -45,5 +45,4 @@
     </orderEntry>
     <orderEntry type="library" scope="PROVIDED" name="Groovy" level="project" />
   </component>
-</module>
-
+</module>
\ No newline at end of file
diff --git a/plugins/gradle/tooling-extension-impl/gradle-tooling-extension-impl.iml b/plugins/gradle/tooling-extension-impl/gradle-tooling-extension-impl.iml
index ee0933e6e560..c57061fe2392 100644
--- a/plugins/gradle/tooling-extension-impl/gradle-tooling-extension-impl.iml
+++ b/plugins/gradle/tooling-extension-impl/gradle-tooling-extension-impl.iml
@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <module type="JAVA_MODULE" version="4">
-  <component name="NewModuleRootManager" inherit-compiler-output="true">
+  <component name="NewModuleRootManager" LANGUAGE_LEVEL="JDK_1_6" inherit-compiler-output="true">
     <exclude-output />
     <content url="file://$MODULE_DIR$">
       <sourceFolder url="file://$MODULE_DIR$/src" isTestSource="false" />
@@ -72,5 +72,4 @@
     </orderEntry>
     <orderEntry type="library" name="gson" level="project" />
   </component>
-</module>
-
+</module>
\ No newline at end of file