diff --git a/rules.mk b/rules.mk
index 926e2d1b10..865e204dcb 100644
--- a/rules.mk
+++ b/rules.mk
@@ -265,7 +265,7 @@ 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