diff --git a/rules.mk b/rules.mk
index 96f2d8c112..e97b3f6491 100644
--- a/rules.mk
+++ b/rules.mk
@@ -281,7 +281,7 @@ PATCH:=patch
 PYTHON:=python
 
 INSTALL_BIN:=install -m0755
-INSTALL_SUID:install -m4755
+INSTALL_SUID:=install -m4755
 INSTALL_DIR:=install -d -m0755
 INSTALL_DATA:=install -m0644
 INSTALL_CONF:=install -m0600