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-rw-r--r--sys/dev/hyperv/utilities/hv_heartbeat.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/sys/dev/hyperv/utilities/hv_heartbeat.c b/sys/dev/hyperv/utilities/hv_heartbeat.c
index 46493ee..be0f3e6 100644
--- a/sys/dev/hyperv/utilities/hv_heartbeat.c
+++ b/sys/dev/hyperv/utilities/hv_heartbeat.c
@@ -33,6 +33,7 @@
#include <sys/module.h>
#include <sys/timetc.h>
#include <sys/syscallsubr.h>
+#include <sys/systm.h>
#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/include/vmbus.h>
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