diff --git a/services/Android.bp b/services/Android.bp
index 654e8d0..b40034a 100644
--- a/services/Android.bp
+++ b/services/Android.bp
@@ -20,6 +20,7 @@
             "-Xep:NullTernary:ERROR",
             "-Xep:TryFailThrowable:ERROR",
             "-Xep:HashtableContains:ERROR",
+            "-Xep:FormatString:ERROR",
             // NOTE: only enable to generate local patchfiles
             // "-XepPatchChecks:refaster:frameworks/base/errorprone/refaster/EfficientXml.java.refaster",
             // "-XepPatchLocation:/tmp/refaster/",
diff --git a/services/devicepolicy/java/com/android/server/devicepolicy/PolicyVersionUpgrader.java b/services/devicepolicy/java/com/android/server/devicepolicy/PolicyVersionUpgrader.java
index 6bc7ba6..f0ceb31 100644
--- a/services/devicepolicy/java/com/android/server/devicepolicy/PolicyVersionUpgrader.java
+++ b/services/devicepolicy/java/com/android/server/devicepolicy/PolicyVersionUpgrader.java
@@ -184,7 +184,7 @@
             Files.write(file.toPath(), versionBytes);
             versionFile.commit();
         } catch (IOException e) {
-            Slog.e(LOG_TAG, String.format("Writing version %d failed: %s", version), e);
+            Slog.e(LOG_TAG, String.format("Writing version %d failed", version), e);
             versionFile.rollback();
         }
     }