diff --git a/.bazelrc b/.bazelrc
index 6ed9fb561..77a279166 100644
--- a/.bazelrc
+++ b/.bazelrc
@@ -168,9 +168,7 @@ build --javacopt "-Xep:EqualsIncompatibleType:ERROR"
 build --javacopt "-Xep:EqualsUnsafeCast:ERROR"
 build --javacopt "-Xep:EqualsUsingHashCode:ERROR"
 build --javacopt "-Xep:ExtendingJUnitAssert:ERROR"
-# TODO(#222) Increase to error when we build from jflex-1.7.1 with a lexer annotated with
-# @SuppressWarnings
-build --javacopt "-Xep:FallThrough:WARN"
+build --javacopt "-Xep:FallThrough:ERROR"
 build --javacopt "-Xep:Finally:ERROR"
 build --javacopt "-Xep:FloatCast:ERROR"
 build --javacopt "-Xep:FloatingPointAssertionWithinEpsilon:ERROR"
diff --git a/pom.xml b/pom.xml
index 501586ce7..9af0150e2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -474,7 +474,7 @@
               <target>8</target>
               <compilerArgs>
                 <arg>-XDcompilePolicy=simple</arg>
-                <arg>-Xplugin:ErrorProne -Xep:FallThrough:WARN</arg>
+                <arg>-Xplugin:ErrorProne</arg>
               </compilerArgs>
               <annotationProcessorPaths>
                 <path>