diff --git a/gdb/testsuite/gdb.opt/inline-small-func.h b/gdb/testsuite/gdb.opt/inline-small-func.h
index 66323952cf4..44b6e86fc15 100644
--- a/gdb/testsuite/gdb.opt/inline-small-func.h
+++ b/gdb/testsuite/gdb.opt/inline-small-func.h
@@ -13,9 +13,15 @@
    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
 
+#ifdef __GNUC__
+#define ATTR __attribute__((always_inline))
+#else
+#define ATTR
+#endif
+
 int counter = 42;
 
-inline void
+inline ATTR void
 callee () {
   counter = 0;	/* callee: body.  */
 }