diff --git a/toolchain/toolchain/toolchain.mk b/toolchain/toolchain/toolchain.mk
index b55b0c712c..179c09edf1 100644
--- a/toolchain/toolchain/toolchain.mk
+++ b/toolchain/toolchain/toolchain.mk
@@ -13,18 +13,18 @@ endif
 TOOLCHAIN_ADD_TOOLCHAIN_DEPENDENCY = NO
 
 # Apply a hack that Rick Felker suggested[1] to avoid conflicts between libc
-# headers and kernel headers. This is a temporary measure until musl finds a
-# better solution.
+# headers and kernel headers. This is needed for kernel headers older than
+# 4.15. Kernel headers 4.15 and newer don't require __GLIBC__ to be defined.
 #
 # Augment the original suggestion with __USE_MISC since recent kernels
-# require this glibc internal macro. Also, as musl defines IFF_LOWER_UP,
-# IFF_DORMANT and IFF_ECHO, add another macro to suppress them in the
-# kernel header, and avoid macro/enum conflict.
+# (older than 4.15) require this glibc internal macro. Also, as musl defines
+# IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO, add another macro to suppress
+# them in the kernel header, and avoid macro/enum conflict.
 #
 # Kernel version 3.12 introduced the libc-compat.h header.
 #
 # [1] http://www.openwall.com/lists/musl/2015/10/08/2
-ifeq ($(BR2_TOOLCHAIN_USES_MUSL)$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12),yy)
+ifeq ($(BR2_TOOLCHAIN_USES_MUSL)$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15),yy:)
 define TOOLCHAIN_MUSL_KERNEL_HEADERS_COMPATIBILITY_HACK
 	$(SED) 's/^#if defined(__GLIBC__)$$/#if 1/' \
 		$(STAGING_DIR)/usr/include/linux/libc-compat.h