diff --git a/src/sna/sna_driver.c b/src/sna/sna_driver.c
index 3c611a17..5b47bc7c 100644
--- a/src/sna/sna_driver.c
+++ b/src/sna/sna_driver.c
@@ -57,6 +57,13 @@ USE OR OTHER DEALINGS IN THE SOFTWARE.
 #include <mi.h>
 #include <micmap.h>
 
+#if defined(HAVE_X11_EXTENSIONS_DPMSCONST_H)
+#include <X11/extensions/dpmsconst.h>
+#else
+#define DPMSModeOn 0
+#define DPMSModeOff 3
+#endif
+
 #include <sys/ioctl.h>
 #include <sys/fcntl.h>
 #include <sys/poll.h>