diff --git a/shared/nm-glib-aux/nm-macros-internal.h b/shared/nm-glib-aux/nm-macros-internal.h
index 551cd92f16..c9862be423 100644
--- a/shared/nm-glib-aux/nm-macros-internal.h
+++ b/shared/nm-glib-aux/nm-macros-internal.h
@@ -1233,6 +1233,16 @@ nm_strcmp_p (gconstpointer a, gconstpointer b)
 
 /*****************************************************************************/
 
+static inline int
+_NM_IN_STRSET_ASCII_CASE_op_streq (const char *x, const char *s)
+{
+	return s && g_ascii_strcasecmp (x, s) == 0;
+}
+
+#define NM_IN_STRSET_ASCII_CASE(x, ...) _NM_IN_STRSET_EVAL_N(||, _NM_IN_STRSET_ASCII_CASE_op_streq, x, NM_NARG (__VA_ARGS__), __VA_ARGS__)
+
+/*****************************************************************************/
+
 #define nm_g_slice_free(ptr) \
 	g_slice_free (typeof (*(ptr)), ptr)
 
diff --git a/shared/nm-glib-aux/tests/test-shared-general.c b/shared/nm-glib-aux/tests/test-shared-general.c
index 37d6618ad8..afccb969f0 100644
--- a/shared/nm-glib-aux/tests/test-shared-general.c
+++ b/shared/nm-glib-aux/tests/test-shared-general.c
@@ -891,6 +891,25 @@ again:
 
 /*****************************************************************************/
 
+static void
+test_in_strset_ascii_case (void)
+{
+	const char *x;
+
+	x = NULL;
+	g_assert (NM_IN_STRSET_ASCII_CASE (x, NULL));
+	g_assert (NM_IN_STRSET_ASCII_CASE (x, NULL, "b"));
+	g_assert (!NM_IN_STRSET_ASCII_CASE (x, "b"));
+
+	x = "b";
+	g_assert (NM_IN_STRSET (x, "b"));
+	g_assert (NM_IN_STRSET_ASCII_CASE (x, "b"));
+	g_assert (!NM_IN_STRSET (x, "B"));
+	g_assert (NM_IN_STRSET_ASCII_CASE (x, "B"));
+}
+
+/*****************************************************************************/
+
 NMTST_DEFINE ();
 
 int main (int argc, char **argv)
@@ -913,6 +932,7 @@ int main (int argc, char **argv)
 	g_test_add_func ("/general/test_nm_utils_get_next_realloc_size", test_nm_utils_get_next_realloc_size);
 	g_test_add_func ("/general/test_nm_str_buf", test_nm_str_buf);
 	g_test_add_func ("/general/test_nm_utils_parse_next_line", test_nm_utils_parse_next_line);
+	g_test_add_func ("/general/test_in_strset_ascii_case", test_in_strset_ascii_case);
 
 	return g_test_run ();
 }