diff --git a/app/src/main/java/org/solovyev/android/calculator/preferences/NumberFormatPreference.java b/app/src/main/java/org/solovyev/android/calculator/preferences/NumberFormatPreference.java
index a7424ae4..f921f8a6 100644
--- a/app/src/main/java/org/solovyev/android/calculator/preferences/NumberFormatPreference.java
+++ b/app/src/main/java/org/solovyev/android/calculator/preferences/NumberFormatPreference.java
@@ -21,7 +21,6 @@ import org.solovyev.common.NumberFormatter;
 
 import butterknife.Bind;
 import butterknife.ButterKnife;
-import jscl.JsclMathEngine;
 
 import static org.solovyev.android.calculator.Engine.Preferences.Output;