diff --git a/ChangeLog b/ChangeLog
index 87f7a9c867..55f989a5a1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+2018-06-14  Joseph Myers  <joseph@codesourcery.com>
+
+	* string/tester.c (test_strncat) [__GNUC_PREREQ (7, 0)]: Also
+	ignore -Wrestrict for one test.
+
 2018-06-14  Steve Ellcey  <sellcey@caviumnetworks.com>
 	    Szabolcs Nagy  <szabolcs.nagy@arm.com>
 
diff --git a/string/tester.c b/string/tester.c
index 2bb38bfe23..601eb01b55 100644
--- a/string/tester.c
+++ b/string/tester.c
@@ -485,6 +485,10 @@ test_strncat (void)
 	       deliberately tested here; GCC 8 gives a -Warray-bounds
 	       warning about this.  */
 	    DIAG_IGNORE_NEEDS_COMMENT (7, "-Wstringop-overflow=");
+	    /* GCC 9 as of 2018-06-14 warns that the size passed is
+	       large enough that, if it were the actual object size,
+	       the objects would have to overlap.  */
+	    DIAG_IGNORE_NEEDS_COMMENT (9, "-Wrestrict");
 #endif
 	    DIAG_IGNORE_NEEDS_COMMENT (8, "-Warray-bounds");
 	    check (strncat (buf1 + n2, buf2 + n1, ~((size_t) 0) - n4)