diff --git a/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/DefaultLocale.java b/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/DefaultLocale.java
deleted file mode 100644
index 966818425..000000000
--- a/baseline-error-prone/src/main/java/com/palantir/baseline/errorprone/DefaultLocale.java
+++ /dev/null
@@ -1,64 +0,0 @@
-/*
- * (c) Copyright 2019 Palantir Technologies Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.palantir.baseline.errorprone;
-
-import com.google.auto.service.AutoService;
-import com.google.errorprone.BugPattern;
-import com.google.errorprone.BugPattern.SeverityLevel;
-import com.google.errorprone.VisitorState;
-import com.google.errorprone.bugpatterns.BugChecker;
-import com.google.errorprone.fixes.SuggestedFix;
-import com.google.errorprone.fixes.SuggestedFixes;
-import com.google.errorprone.matchers.Description;
-import com.google.errorprone.matchers.Matcher;
-import com.google.errorprone.matchers.method.MethodMatchers;
-import com.sun.source.tree.ExpressionTree;
-import com.sun.source.tree.MethodInvocationTree;
-
-@AutoService(BugChecker.class)
-@BugPattern(
-        link = "https://github.com/palantir/gradle-baseline#baseline-error-prone-checks",
-        linkType = BugPattern.LinkType.CUSTOM,
-        summary = "Implicit use of the platform default locale, which can result in differing behaviour between JVM"
-                + " executions.",
-        severity = SeverityLevel.SUGGESTION)
-public final class DefaultLocale extends BugChecker implements BugChecker.MethodInvocationTreeMatcher {
-
-    private static final long serialVersionUID = 1L;
-
-    private static final Matcher<ExpressionTree> MATCHER = MethodMatchers.instanceMethod()
-            .onExactClass("java.lang.String")
-            .namedAnyOf("toLowerCase", "toUpperCase")
-            .withNoParameters();
-
-    @Override
-    public Description matchMethodInvocation(MethodInvocationTree tree, VisitorState state) {
-        if (MATCHER.matches(tree, state)) {
-            SuggestedFix.Builder fix = SuggestedFix.builder();
-            return buildDescription(tree)
-                    .addFix(fix.replace(
-                                    state.getEndPosition(tree.getMethodSelect()),
-                                    state.getEndPosition(tree),
-                                    String.format(
-                                            "(%s.ROOT)", SuggestedFixes.qualifyType(state, fix, "java.util.Locale")))
-                            .build())
-                    .build();
-        }
-
-        return Description.NO_MATCH;
-    }
-}
diff --git a/baseline-error-prone/src/test/java/com/palantir/baseline/errorprone/DefaultLocaleTest.java b/baseline-error-prone/src/test/java/com/palantir/baseline/errorprone/DefaultLocaleTest.java
deleted file mode 100644
index 9fc267211..000000000
--- a/baseline-error-prone/src/test/java/com/palantir/baseline/errorprone/DefaultLocaleTest.java
+++ /dev/null
@@ -1,66 +0,0 @@
-/*
- * (c) Copyright 2020 Palantir Technologies Inc. All rights reserved.
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *     http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-package com.palantir.baseline.errorprone;
-
-import org.junit.jupiter.api.Test;
-
-class DefaultLocaleTest {
-
-    @Test
-    void testFixToLowerCase() {
-        fix().addInputLines(
-                        "Test.java",
-                        "class Test {",
-                        "  String f(String s) {",
-                        "    return s.toLowerCase();",
-                        "  }",
-                        "}")
-                .addOutputLines(
-                        "Test.java",
-                        "import java.util.Locale;",
-                        "class Test {",
-                        "  String f(String s) {",
-                        "    return s.toLowerCase(Locale.ROOT);",
-                        "  }",
-                        "}")
-                .doTest();
-    }
-
-    @Test
-    void testFixToUpperCase() {
-        fix().addInputLines(
-                        "Test.java",
-                        "class Test {",
-                        "  String f(String s) {",
-                        "    return s.toUpperCase();",
-                        "  }",
-                        "}")
-                .addOutputLines(
-                        "Test.java",
-                        "import java.util.Locale;",
-                        "class Test {",
-                        "  String f(String s) {",
-                        "    return s.toUpperCase(Locale.ROOT);",
-                        "  }",
-                        "}")
-                .doTest();
-    }
-
-    private RefactoringValidator fix() {
-        return RefactoringValidator.of(DefaultLocale.class, getClass());
-    }
-}
diff --git a/gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/BaselineErrorProne.java b/gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/BaselineErrorProne.java
index ec383590f..f97b42c9a 100644
--- a/gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/BaselineErrorProne.java
+++ b/gradle-baseline-java/src/main/groovy/com/palantir/baseline/plugins/BaselineErrorProne.java
@@ -133,9 +133,6 @@ private static void configureErrorProneOptions(
                 "CanIgnoreReturnValueSuggester",
                 "InlineMeSuggester",
                 "PreferImmutableStreamExCollections",
-                // StringCaseLocaleUsage duplicates our existing DefaultLocale check which is already
-                // enforced in some places.
-                "StringCaseLocaleUsage",
                 "UnnecessaryTestMethodPrefix",
                 "UnusedVariable",
                 // See VarUsage: The var keyword results in illegible code in most cases and should not be used.