diff --git a/core/combo/TARGET_linux-x86.mk b/core/combo/TARGET_linux-x86.mk
index 1361be2960..01f8242bd1 100644
--- a/core/combo/TARGET_linux-x86.mk
+++ b/core/combo/TARGET_linux-x86.mk
@@ -106,7 +106,6 @@ android_config_h := $(call select-android-config-h,target_linux-x86)
 
 $(combo_2nd_arch_prefix)TARGET_GLOBAL_CFLAGS += \
 			-O2 \
-			-Ulinux \
 			-Wa,--noexecstack \
 			-Werror=format-security \
 			-D_FORTIFY_SOURCE=2 \
diff --git a/core/combo/TARGET_linux-x86_64.mk b/core/combo/TARGET_linux-x86_64.mk
index 2e06263d25..a5a745b4cc 100644
--- a/core/combo/TARGET_linux-x86_64.mk
+++ b/core/combo/TARGET_linux-x86_64.mk
@@ -106,7 +106,6 @@ KERNEL_HEADERS := $(KERNEL_HEADERS_COMMON) $(KERNEL_HEADERS_ARCH)
 
 TARGET_GLOBAL_CFLAGS += \
 			-O2 \
-			-Ulinux \
 			-Wa,--noexecstack \
 			-Werror=format-security \
 			-D_FORTIFY_SOURCE=2 \