diff --git a/libc/bionic/system_properties_compat.c b/libc/bionic/system_properties_compat.c
index 6dbc4ccea..0326f053a 100644
--- a/libc/bionic/system_properties_compat.c
+++ b/libc/bionic/system_properties_compat.c
@@ -48,6 +48,7 @@ struct prop_area_compat {
     unsigned volatile serial;
     unsigned magic;
     unsigned version;
+    unsigned reserved[4];
     unsigned toc[1];
 };