diff --git a/src/main/java/com/google/devtools/build/lib/platform/SystemDiskSpaceModule.java b/src/main/java/com/google/devtools/build/lib/platform/SystemDiskSpaceModule.java
index dc1bec2..a71dd8f 100644
--- a/src/main/java/com/google/devtools/build/lib/platform/SystemDiskSpaceModule.java
+++ b/src/main/java/com/google/devtools/build/lib/platform/SystemDiskSpaceModule.java
@@ -57,6 +57,6 @@
     if (reporter != null) {
       reporter.post(event);
     }
-    logger.atInfo().log(event.logString());
+    logger.atInfo().log("%s", event.logString());
   }
 }