diff --git a/ChangeLog b/ChangeLog
index 7d95ee3..71c69f4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,7 @@
 2026-07-22  Maximilian Muecke  <muecke.maximilian@gmail.com>
 
+	* R/implied.R (AmericanOptionImpliedVolatility.default): Assign the
+	ImpliedVolatility class used by the registered print and summary methods
 	* R/affine.R (AffineSwaption.default): Correct default handling of the
 	payFixed parameter
 	* src/utils.cpp: Accept "Euribor1W" as an alias for "EuriborSW" in
diff --git a/R/implied.R b/R/implied.R
index 828fb17..5f4ac74 100644
--- a/R/implied.R
+++ b/R/implied.R
@@ -60,6 +60,7 @@ AmericanOptionImpliedVolatility.default <- function(type, value, underlying, str
                                                  if (inherits(maturity, "Date")) maturity else NULL,
                                                  volatility, timeSteps, gridPoints,
                                                  dayCounter)
+    class(val) <- c("AmericanOptionImpliedVolatility", "ImpliedVolatility")
     val
 }