diff --git a/Core/build.gradle b/Core/build.gradle
index a0bee08a6..ae9dc17d4 100644
--- a/Core/build.gradle
+++ b/Core/build.gradle
@@ -1,5 +1,9 @@
 dependencies {
     compile 'org.yaml:snakeyaml:1.16'
 }
+
+sourceCompatibility = 1.7
+targetCompatibility = 1.7
+
 jar.archiveName="PlotSquared-API-${parent.version}.jar"
 jar.destinationDir = file '../target'
\ No newline at end of file