diff --git a/programs/bpf/c/sdk/bpf.mk b/programs/bpf/c/sdk/bpf.mk
index 9fc5a49208..75d73e7f58 100644
--- a/programs/bpf/c/sdk/bpf.mk
+++ b/programs/bpf/c/sdk/bpf.mk
@@ -6,7 +6,6 @@ ifneq ($(V),1)
 _@ :=@
 endif
 
-SYSTEM_INC_DIRS ?= -isystem $(dir $(lastword $(MAKEFILE_LIST)))inc
 INC_DIRS ?=
 SRC_DIR ?= ./src
 OUT_DIR ?= ./out
@@ -18,6 +17,8 @@ else
 LLVM_DIR ?= /usr/local/opt/llvm
 endif
 
+SYSTEM_INC_DIRS := -isystem $(dir $(lastword $(MAKEFILE_LIST)))inc
+
 CC := $(LLVM_DIR)/bin/clang
 CC_FLAGS := \
   -Werror \