diff --git a/core/build.xml b/core/build.xml
index b4ee250f1..11f2fc352 100644
--- a/core/build.xml
+++ b/core/build.xml
@@ -112,7 +112,7 @@
 				<attribute name="Main-Class" value="${main-class}"/>
 				<attribute name="SplashScreen-Image" value="pix/splashscreen.png"/>
 			</manifest>
-			<zipfileset src="lib/exp4j-0.2.9.jar" />
+			<zipfileset src="lib/exp4j-rdg.jar" />
 		</jar>
 	</target>
 
diff --git a/core/lib/exp4j-0.2.9.jar b/core/lib/exp4j-0.2.9.jar
deleted file mode 100644
index a1209940a..000000000
Binary files a/core/lib/exp4j-0.2.9.jar and /dev/null differ