diff --git a/utest/test_fork.c b/utest/test_fork.c
index e7a8dbcee..9e0244305 100644
--- a/utest/test_fork.c
+++ b/utest/test_fork.c
@@ -32,6 +32,7 @@ USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 **********************************************************************************/
 
 #include "openblas_utest.h"
+#include <sys/types.h>
 #include <sys/wait.h>
 #include <cblas.h>