diff --git a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsage.java b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsage.java
index e2570a2fd51..0b94f27978e 100644
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsage.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsage.java
@@ -3,16 +3,12 @@
 import static com.google.errorprone.BugPattern.LinkType.CUSTOM;
 import static com.google.errorprone.BugPattern.SeverityLevel.SUGGESTION;
 import static com.google.errorprone.BugPattern.StandardTags.STYLE;
-import static com.sun.source.tree.Tree.Kind.IDENTIFIER;
 import static com.sun.source.tree.Tree.Kind.INSTANCE_OF;
 import static com.sun.source.tree.Tree.Kind.LAMBDA_EXPRESSION;
-import static com.sun.source.tree.Tree.Kind.MEMBER_SELECT;
-import static com.sun.source.tree.Tree.Kind.METHOD_INVOCATION;
 import static tech.picnic.errorprone.bugpatterns.util.Documentation.BUG_PATTERNS_BASE_URL;
 
 import com.google.auto.service.AutoService;
 import com.google.common.collect.ImmutableList;
-import com.google.common.collect.ImmutableSet;
 import com.google.errorprone.BugPattern;
 import com.google.errorprone.VisitorState;
 import com.google.errorprone.bugpatterns.BugChecker;
@@ -20,11 +16,8 @@
 import com.google.errorprone.fixes.SuggestedFix;
 import com.google.errorprone.fixes.SuggestedFixes;
 import com.google.errorprone.matchers.Description;
-import com.sun.source.tree.IdentifierTree;
 import com.sun.source.tree.InstanceOfTree;
 import com.sun.source.tree.LambdaExpressionTree;
-import com.sun.source.tree.MemberSelectTree;
-import com.sun.source.tree.MethodInvocationTree;
 
 /** A {@link BugChecker} that aligns usages of T.class::isInstance. */
 @AutoService(BugChecker.class)
@@ -42,36 +35,13 @@ public IsInstanceUsage() {}
 
   @Override
   public Description matchLambdaExpression(LambdaExpressionTree tree, VisitorState state) {
-    if (ImmutableSet.of(LAMBDA_EXPRESSION, METHOD_INVOCATION).contains(tree.getKind())) {
-      if (INSTANCE_OF == tree.getBody().getKind()) {
-        return constructDescription(
-            tree, state, constructFix(tree, ((InstanceOfTree) tree.getBody()).getType()));
-      } else if (METHOD_INVOCATION == tree.getBody().getKind()) {
-        return treatMethodInvocation(tree, (MethodInvocationTree) tree.getBody(), state);
-      }
+    if (LAMBDA_EXPRESSION == tree.getKind() && INSTANCE_OF == tree.getBody().getKind()) {
+      return constructDescription(
+          tree, state, constructFix(tree, ((InstanceOfTree) tree.getBody()).getType()));
     }
     return Description.NO_MATCH;
   }
 
-  private Description treatMethodInvocation(
-      LambdaExpressionTree tree, MethodInvocationTree methodInvocationTree, VisitorState state) {
-    if (MEMBER_SELECT != methodInvocationTree.getMethodSelect().getKind()
-        || !((MemberSelectTree) methodInvocationTree.getMethodSelect())
-            .getIdentifier()
-            .contentEquals("isInstance")) {
-      return Description.NO_MATCH;
-    }
-    MemberSelectTree methodSelect = (MemberSelectTree) methodInvocationTree.getMethodSelect();
-    if (MEMBER_SELECT != methodSelect.getExpression().getKind()
-        || IDENTIFIER
-            != ((MemberSelectTree) methodSelect.getExpression()).getExpression().getKind()) {
-      return Description.NO_MATCH;
-    }
-    IdentifierTree identifierTree =
-        (IdentifierTree) ((MemberSelectTree) methodSelect.getExpression()).getExpression();
-    return constructDescription(tree, state, constructFix(tree, identifierTree.getName()));
-  }
-
   private Description constructDescription(
       LambdaExpressionTree tree, VisitorState state, SuggestedFix.Builder fixBuilder) {
     SuggestedFix fix = fixBuilder.build();
diff --git a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/MethodReferenceUsage.java b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/MethodReferenceUsage.java
index bc3d2afc850..7bd04ad1d8e 100644
--- a/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/MethodReferenceUsage.java
+++ b/error-prone-contrib/src/main/java/tech/picnic/errorprone/bugpatterns/MethodReferenceUsage.java
@@ -106,6 +106,7 @@ private static Optional<SuggestedFix.Builder> constructMethodRef(
   }
 
   // XXX: Replace nested `Optional` usage.
+  // XXX: Cover for deeper method invocation like `T.class.isInstance(i)`.
   @SuppressWarnings("NestedOptionals")
   private static Optional<SuggestedFix.Builder> constructMethodRef(
       LambdaExpressionTree lambdaExpr, MethodInvocationTree subTree) {
diff --git a/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsageTest.java b/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsageTest.java
index 1584a7a135c..74a56354c29 100644
--- a/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsageTest.java
+++ b/error-prone-contrib/src/test/java/tech/picnic/errorprone/bugpatterns/IsInstanceUsageTest.java
@@ -22,8 +22,6 @@ void identification() {
             "    // BUG: Diagnostic contains:",
             "    Flux.just(1).filter(i -> i instanceof Integer);",
             "    // BUG: Diagnostic contains:",
-            "    Flux.just(1).filter(i -> Integer.class.isInstance(i));",
-            "    // BUG: Diagnostic contains:",
             "    Flux.just(1).onErrorResume(t -> t instanceof Exception, t -> Flux.empty());",
             "",
             "    Flux.just(1).filter(Integer.class::isInstance);",
@@ -44,7 +42,6 @@ void replacement() {
             "class A {",
             "  void m() {",
             "    Flux.just(1).filter(i -> i instanceof Integer);",
-            "    Flux.just(1).filter(i -> Integer.class.isInstance(i));",
             "  }",
             "}")
         .addOutputLines(
@@ -54,7 +51,6 @@ void replacement() {
             "class A {",
             "  void m() {",
             "    Flux.just(1).filter(Integer.class::isInstance);",
-            "    Flux.just(1).filter(Integer.class::isInstance);",
             "  }",
             "}")
         .doTest(BugCheckerRefactoringTestHelper.TestMode.TEXT_MATCH);