diff --git a/flang/test/Parser/OpenMP/threadprivate-blank-common-block.f90 b/flang/test/Parser/OpenMP/threadprivate-blank-common-block.f90
new file mode 100644
index 0000000000000..6317258e6ec8d
--- /dev/null
+++ b/flang/test/Parser/OpenMP/threadprivate-blank-common-block.f90
@@ -0,0 +1,9 @@
+! RUN: not %flang_fc1 -fsyntax-only %s -fopenmp 2>&1 | FileCheck %s
+! From Standard: A blank common block cannot appear in a threadprivate directive.
+
+program main
+    integer :: a
+    common//a
+    !CHECK: error: expected one of '$@ABCDEFGHIJKLMNOPQRSTUVWXYZ_'
+    !$omp threadprivate(//)
+ end