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-rw-r--r--arch/um/os-Linux/tls.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/um/os-Linux/tls.c b/arch/um/os-Linux/tls.c
index a2de2580b8a..16215b99080 100644
--- a/arch/um/os-Linux/tls.c
+++ b/arch/um/os-Linux/tls.c
@@ -1,4 +1,5 @@
#include <errno.h>
+#include <unistd.h>
#include <sys/ptrace.h>
#include <sys/syscall.h>
#include <asm/ldt.h>