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diff --git a/libgomp/testsuite/libgomp.fortran/appendix-a/a.18.1.f90 b/libgomp/testsuite/libgomp.fortran/appendix-a/a.18.1.f90
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+! { dg-do run }
+! { dg-options "-ffixed-form" }
+      REAL FUNCTION FN1(I)
+        INTEGER I
+        FN1 = I * 2.0
+        RETURN
+      END FUNCTION FN1
+
+      REAL FUNCTION FN2(A, B)
+        REAL A, B
+        FN2 = A + B
+        RETURN
+      END FUNCTION FN2
+
+      PROGRAM A18
+      INCLUDE "omp_lib.h"     ! or USE OMP_LIB
+      INTEGER ISYNC(256)
+      REAL    WORK(256)
+      REAL    RESULT(256)
+      INTEGER IAM, NEIGHBOR
+!$OMP PARALLEL PRIVATE(IAM, NEIGHBOR) SHARED(WORK, ISYNC) NUM_THREADS(4)
+          IAM = OMP_GET_THREAD_NUM() + 1
+          ISYNC(IAM) = 0
+!$OMP BARRIER
+!     Do computation into my portion of work array
+          WORK(IAM) = FN1(IAM)
+!     Announce that I am done with my work.
+!     The first flush ensures that my work is made visible before
+!     synch. The second flush ensures that synch is made visible.
+!$OMP FLUSH(WORK,ISYNC)
+       ISYNC(IAM) = 1
+!$OMP FLUSH(ISYNC)
+
+!      Wait until neighbor is done. The first flush ensures that
+!      synch is read from memory, rather than from the temporary
+!      view of memory. The second flush ensures that work is read
+!      from memory, and is done so after the while loop exits.
+       IF (IAM .EQ. 1) THEN
+            NEIGHBOR = OMP_GET_NUM_THREADS()
+        ELSE
+            NEIGHBOR = IAM - 1
+        ENDIF
+        DO WHILE (ISYNC(NEIGHBOR) .EQ. 0)
+!$OMP FLUSH(ISYNC)
+        END DO
+!$OMP FLUSH(WORK, ISYNC)
+        RESULT(IAM) = FN2(WORK(NEIGHBOR), WORK(IAM))
+!$OMP END PARALLEL
+        DO I=1,4
+          IF (I .EQ. 1) THEN
+                NEIGHBOR = 4
+          ELSE
+                NEIGHBOR = I - 1
+          ENDIF
+          IF (RESULT(I) .NE. I * 2 + NEIGHBOR * 2) THEN
+            CALL ABORT
+          ENDIF
+        ENDDO
+        END PROGRAM A18