diff --git a/package/diffutils/diffutils.mk b/package/diffutils/diffutils.mk
index 6e5b9b6744..79785d6f01 100644
--- a/package/diffutils/diffutils.mk
+++ b/package/diffutils/diffutils.mk
@@ -11,6 +11,12 @@ DIFFUTILS_DEPENDENCIES = $(TARGET_NLS_DEPENDENCIES)
 DIFFUTILS_LICENSE = GPL-3.0+
 DIFFUTILS_LICENSE_FILES = COPYING
 
+# Since glibc >= 2.26, don't try to use getopt_long replacement bundled
+# with diffutils. It will conflict with the one from glibc.
+ifeq ($(BR2_TOOLCHAIN_USES_GLIBC),y)
+DIFFUTILS_CONF_ENV += gl_cv_func_getopt_gnu=yes
+endif
+
 ifeq ($(BR2_PACKAGE_BUSYBOX),y)
 DIFFUTILS_DEPENDENCIES += busybox
 endif