diff --git a/src/asciidoc/core-expressions.adoc b/src/asciidoc/core-expressions.adoc
index 86e34a5061c..477608efdbf 100644
--- a/src/asciidoc/core-expressions.adoc
+++ b/src/asciidoc/core-expressions.adoc
@@ -785,7 +785,7 @@ expression based `matches` operator.
 ----
 	// evaluates to false
 	boolean falseValue = parser.parseExpression(
-			"'xyz' instanceof T(Integer.class)").getValue(Boolean.class);
+			"'xyz' instanceof T(Integer)").getValue(Boolean.class);
 
 	// evaluates to true
 	boolean trueValue = parser.parseExpression(
@@ -799,7 +799,7 @@ expression based `matches` operator.
 [NOTE]
 ====
 Be careful with primitive types as they are immediately boxed up to the wrapper type,
-so `1 instanceof T(int)` evaluates to `false` while `1 instanceof T(Integer.class)`
+so `1 instanceof T(int)` evaluates to `false` while `1 instanceof T(Integer)`
 evaluates to `true`, as expected.
 ====