diff --git a/base-plugin/src/main/groovy/com/github/jrubygradle/GenerateGradleRb.groovy b/base-plugin/src/main/groovy/com/github/jrubygradle/GenerateGradleRb.groovy
index 260be15..e22e77a 100644
--- a/base-plugin/src/main/groovy/com/github/jrubygradle/GenerateGradleRb.groovy
+++ b/base-plugin/src/main/groovy/com/github/jrubygradle/GenerateGradleRb.groovy
@@ -100,6 +100,11 @@ class GenerateGradleRb extends DefaultTask implements JRubyAwareTask {
         getGemInstallDir().absolutePath
     }
 
+    @Input
+    protected String getGemInstallDirPath() {
+        getGemInstallDir().absolutePath
+    }
+
     @TaskAction
     @CompileDynamic
     @SuppressWarnings('DuplicateStringLiteral')