diff --git a/app/build.gradle b/app/build.gradle
index 2a85ec4c..a4f0716a 100644
--- a/app/build.gradle
+++ b/app/build.gradle
@@ -19,6 +19,11 @@ android {
         }
     }
 
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_7
+        targetCompatibility JavaVersion.VERSION_1_7
+    }
+
     // avoid Travis failures
     lintOptions {
         abortOnError false