diff --git a/flang/test/Preprocessing/defines.F90 b/flang/test/Preprocessing/defines.F90
new file mode 100644
--- /dev/null
+++ b/flang/test/Preprocessing/defines.F90
@@ -0,0 +1,8 @@
+! RUN: %f18 -E -DFOO=1 -DBAR=2 %s | FileCheck %s
+
+! CHECK: integer :: a = 1
+  integer :: a = FOO
+! CHECK: integer :: b = 2
+  integer :: b = BAR
+
+end program