diff --git a/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-1.f90 b/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-1.f90
index 89748204f05..774c2b869e8 100644
--- a/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-1.f90
+++ b/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-1.f90
@@ -1,6 +1,9 @@
 ! { dg-do run }
 ! { dg-additional-options "-cpp" }
 
+! Disable the acc_on_device builtin; we want to test the libgomp library function.
+! { dg-additional-options -fno-builtin-acc_on_device }
+
 ! { dg-additional-options "-fopt-info-all-omp" }
 ! { dg-additional-options "--param=openacc-privatization=noisy" }
 ! { dg-additional-options "-foffload=-fopt-info-all-omp" }
diff --git a/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-2.f b/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-2.f
index e31e0fc715b..b57beac6f43 100644
--- a/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-2.f
+++ b/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-2.f
@@ -1,5 +1,8 @@
 ! { dg-do run }
-! { dg-additional-options "-cpp -fno-builtin-acc_on_device" }
+! { dg-additional-options "-cpp" }
+
+! Disable the acc_on_device builtin; we want to test the libgomp library function.
+! { dg-additional-options -fno-builtin-acc_on_device }
 
 ! { dg-additional-options "-fopt-info-all-omp" }
 ! { dg-additional-options "--param=openacc-privatization=noisy" }
diff --git a/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-3.f b/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-3.f
index 0595be241f8..969d530e30f 100644
--- a/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-3.f
+++ b/libgomp/testsuite/libgomp.oacc-fortran/acc_on_device-1-3.f
@@ -1,5 +1,8 @@
 ! { dg-do run }
-! { dg-additional-options "-cpp -fno-builtin-acc_on_device" }
+! { dg-additional-options "-cpp" }
+
+! Disable the acc_on_device builtin; we want to test the libgomp library function.
+! { dg-additional-options -fno-builtin-acc_on_device }
 
 ! { dg-additional-options "-fopt-info-all-omp" }
 ! { dg-additional-options "--param=openacc-privatization=noisy" }