diff --git a/liboverlay/overlayWriteback.cpp b/liboverlay/overlayWriteback.cpp
index fdead74..08af00f 100644
--- a/liboverlay/overlayWriteback.cpp
+++ b/liboverlay/overlayWriteback.cpp
@@ -261,7 +261,7 @@
         utils::getDump(buf, len, "WBData", sWb->mFbData);
         char str[4] = {'\0'};
         snprintf(str, 4, "\n");
-        strncat(buf, str, strlen(str));
+        strlcat(buf, str, len);
         return true;
     }
     return false;