diff --git a/libs/androidfw/ObbFile.cpp b/libs/androidfw/ObbFile.cpp
index 195fa9a..95332a3 100644
--- a/libs/androidfw/ObbFile.cpp
+++ b/libs/androidfw/ObbFile.cpp
@@ -337,7 +337,9 @@
         return false;
     }
 
-    ftruncate(fd, mFooterStart);
+    if (ftruncate(fd, mFooterStart) == -1) {
+        return false;
+    }
 
     return true;
 }