diff --git a/packages/addons/addon-depends/system-tools-depends/i2c-tools/package.mk b/packages/addons/addon-depends/system-tools-depends/i2c-tools/package.mk
index 44162790a9..af69152e10 100644
--- a/packages/addons/addon-depends/system-tools-depends/i2c-tools/package.mk
+++ b/packages/addons/addon-depends/system-tools-depends/i2c-tools/package.mk
@@ -27,7 +27,7 @@ make_target() {
 
 makeinstall_target() {
   make  DESTDIR=${INSTALL} \
-        prefix="/usr" \
+        PREFIX="/usr" \
         EXTRA="py-smbus" \
         PYTHON=${TOOLCHAIN}/bin/python3 \
         install
diff --git a/packages/addons/addon-depends/system-tools-depends/i2c-tools/patches/pyinstalldir.patch b/packages/addons/addon-depends/system-tools-depends/i2c-tools/patches/pyinstalldir.patch
index bcf898a8f4..07ee55d27f 100644
--- a/packages/addons/addon-depends/system-tools-depends/i2c-tools/patches/pyinstalldir.patch
+++ b/packages/addons/addon-depends/system-tools-depends/i2c-tools/patches/pyinstalldir.patch
@@ -6,7 +6,7 @@ diff -ur a/py-smbus/Module.mk b/py-smbus/Module.mk
  
  install-python:
 -	$(DISTUTILS) install
-+	$(DISTUTILS) install --prefix=$(DESTDIR)$(prefix)
++	$(DISTUTILS) install --prefix=$(DESTDIR)$(PREFIX)
  
  all: all-python