diff --git a/test/Lexer/constants-ms.c b/test/Lexer/constants-ms.c
new file mode 100644
index 0000000..8176ec3
--- /dev/null
+++ b/test/Lexer/constants-ms.c
@@ -0,0 +1,12 @@
+// RUN: clang-cc -fsyntax-only -verify -fms-extensions %s
+
+__int8 x1  = 3i8;
+__int16 x2 = 4i16;
+__int32 x3 = 5i32;
+__int64 x5 = 0x42i64;
+__int64 x4 = 70000000i128;
+
+__int64 y = 0x42i64u;  // expected-error {{invalid suffix}}
+__int64 w = 0x43ui64;  // expected-error {{invalid suffix}}
+__int64 z = 9Li64;  // expected-error {{invalid suffix}}
+__int64 q = 10lli64;  // expected-error {{invalid suffix}}