diff --git a/include/bpf.mk b/include/bpf.mk
index a3357f0e297f..9abc6601232c 100644
--- a/include/bpf.mk
+++ b/include/bpf.mk
@@ -33,7 +33,7 @@ BPF_TARGET:=bpf$(if $(CONFIG_BIG_ENDIAN),eb,el)
 BPF_HEADERS_DIR:=$(STAGING_DIR)/bpf-headers
 
 BPF_KERNEL_INCLUDE := \
-	-nostdinc -isystem $(TOOLCHAIN_INC_DIRS) \
+	-nostdinc $(patsubst %,-isystem %,$(TOOLCHAIN_INC_DIRS)) \
 	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include \
 	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/asm/mach-generic \
 	-I$(BPF_HEADERS_DIR)/arch/$(BPF_KARCH)/include/generated \