diff --git a/src/main/java/resources/Force.java b/src/main/java/resources/Force.java
index b660c67..2e5f763 100644
--- a/src/main/java/resources/Force.java
+++ b/src/main/java/resources/Force.java
@@ -13,7 +13,7 @@
         acceleration.updateByForce(value);
     }
 
-    public Pair getValue() {
+    public Pair<Double> getValue() {
         return value;
     }
 }
\ No newline at end of file