diff --git a/services/input/EventHub.cpp b/services/input/EventHub.cpp
index f4e1cec..29e4eed 100644
--- a/services/input/EventHub.cpp
+++ b/services/input/EventHub.cpp
@@ -1243,6 +1243,12 @@
 
     // Enable wake-lock behavior on kernels that support it.
     // TODO: Only need this for devices that can really wake the system.
+#ifndef EVIOCSSUSPENDBLOCK
+    // uapi headers don't include EVIOCSSUSPENDBLOCK, and future kernels
+    // will use an epoll flag instead, so as long as we want to support
+    // this feature, we need to be prepared to define the ioctl ourselves.
+#define EVIOCSSUSPENDBLOCK _IOW('E', 0x91, int)
+#endif
     bool usingSuspendBlockIoctl = !ioctl(fd, EVIOCSSUSPENDBLOCK, 1);
 
     // Tell the kernel that we want to use the monotonic clock for reporting timestamps