diff --git a/include/tgmath.h b/include/tgmath.h
index 2dbb8fd1e174..71460adf813d 100644
--- a/include/tgmath.h
+++ b/include/tgmath.h
@@ -57,14 +57,14 @@
 #define	__tg_type3(e1, e2, e3, t)					\
 	(__tg_type(e1, t) || __tg_type(e2, t) || __tg_type(e3, t))
 #define	__tg_type_corr(e1, e2, e3, t)					\
-	(__tg_type3(e1, e2, e3, t) || __tg_type3(e1, e2, e3, t complex))
+	(__tg_type3(e1, e2, e3, t) || __tg_type3(e1, e2, e3, t _Complex))
 #define	__tg_integer(e1, e2, e3)					\
 	(((__typeof__(e1))1.5 == 1) || ((__typeof__(e2))1.5 == 1) ||	\
 	    ((__typeof__(e3))1.5 == 1))
 #define	__tg_is_complex(e1, e2, e3)					\
-	(__tg_type3(e1, e2, e3, float complex) ||			\
-	    __tg_type3(e1, e2, e3, double complex) ||			\
-	    __tg_type3(e1, e2, e3, long double complex))
+	(__tg_type3(e1, e2, e3, float _Complex) ||			\
+	    __tg_type3(e1, e2, e3, double _Complex) ||			\
+	    __tg_type3(e1, e2, e3, long double _Complex))
 
 #define	__tg_impl_simple(x, y, z, fn, fnf, fnl, ...)			\
 	__builtin_choose_expr(__tg_type_corr(x, y, z, long double),	\