diff --git a/dispatch.h b/dispatch.h
index 4bca8a5..3e3d1a1 100644
--- a/dispatch.h
+++ b/dispatch.h
@@ -23,6 +23,9 @@
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
+
+#include <signal.h>
+
 enum {
 	DISPATCH_BLOCK,
 	DISPATCH_NONBLOCK