diff --git a/gcc/testsuite/g++.dg/DRs/dr188.C b/gcc/testsuite/g++.dg/DRs/dr188.C
new file mode 100644
index 00000000000..f29a9eba1c9
--- /dev/null
+++ b/gcc/testsuite/g++.dg/DRs/dr188.C
@@ -0,0 +1,7 @@
+// DR 188
+// { dg-do compile { target c++11 } }
+// From [diff.expr]p5.
+
+char arr[100];
+// Yields 100 in C++ and sizeof(char*) in C.
+static_assert (sizeof (0, arr) == 100, "");