diff --git a/smack-java7/build.gradle b/smack-java7/build.gradle
index 52f0197d7..78a1799e1 100644
--- a/smack-java7/build.gradle
+++ b/smack-java7/build.gradle
@@ -1,3 +1,9 @@
+// Although the osgi plugin is already applied by the root project's
+// subprojects closure, we need to re-apply it here so that the
+// manifest is a OsgiManifest. Possible caused by
+// evaluationDependsOnChildren in the root project.
+apply plugin: 'osgi'
+
 description = """\
 Smack for Java7 (or higher).
 This is a pseudo-artifact that pulls all the required dependencies to
@@ -13,3 +19,9 @@ dependencies {
 javadoc {
 	enabled = false
 }
+
+jar {
+	manifest {
+		instruction 'Import-Package', '!sun.security.*, *'
+	}
+}
\ No newline at end of file