diff --git a/targets/TARGET_Cypress/TARGET_PSOC6/mtb-pdl-cat1/drivers/source/cy_syslib.c b/targets/TARGET_Cypress/TARGET_PSOC6/mtb-pdl-cat1/drivers/source/cy_syslib.c
index 0842c41cc2..aa36903999 100644
--- a/targets/TARGET_Cypress/TARGET_PSOC6/mtb-pdl-cat1/drivers/source/cy_syslib.c
+++ b/targets/TARGET_Cypress/TARGET_PSOC6/mtb-pdl-cat1/drivers/source/cy_syslib.c
@@ -21,6 +21,9 @@
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
+#if defined(__ARMCC_VERSION)
+#include <arm_compat.h>
+#endif
 
 #include "cy_device.h"