diff --git a/core/src/main/java/it/cavallium/warppi/math/functions/RootSquare.java b/core/src/main/java/it/cavallium/warppi/math/functions/RootSquare.java
index 936f72d5..bd30742e 100644
--- a/core/src/main/java/it/cavallium/warppi/math/functions/RootSquare.java
+++ b/core/src/main/java/it/cavallium/warppi/math/functions/RootSquare.java
@@ -18,7 +18,7 @@ public class RootSquare extends FunctionOperator {
 
 	@Override
 	public boolean equals(final Object o) {
-		if (o instanceof Root) {
+		if (o instanceof Root || o instanceof RootSquare) {
 			final FunctionOperator f = (FunctionOperator) o;
 			return parameter1.equals(f.getParameter1()) && parameter2.equals(f.getParameter2());
 		}