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-rw-r--r--tools/testing/selftests/proc/proc-pidns.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/tools/testing/selftests/proc/proc-pidns.c b/tools/testing/selftests/proc/proc-pidns.c
index 25b9a2933c45..6f7c10fe97b3 100644
--- a/tools/testing/selftests/proc/proc-pidns.c
+++ b/tools/testing/selftests/proc/proc-pidns.c
@@ -6,6 +6,7 @@
#include <assert.h>
#include <errno.h>
+#include <fcntl.h>
#include <sched.h>
#include <stdbool.h>
#include <stdlib.h>