diff --git a/gradle/ide.gradle b/gradle/ide.gradle
index db9503a..f28e88d 100644
--- a/gradle/ide.gradle
+++ b/gradle/ide.gradle
@@ -5,6 +5,12 @@ import org.gradle.plugins.ide.eclipse.model.SourceFolder
 apply plugin: "propdeps-eclipse"
 apply plugin: "propdeps-idea"
 
+eclipse {
+	jdt {
+		javaRuntimeName = "J2SE-1.5"
+	}
+}
+
 eclipse.project.buildCommand "net.sf.eclipsecs.core.CheckstyleBuilder"
 eclipse.project.natures "net.sf.eclipsecs.core.CheckstyleNature"