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-rw-r--r--libps/filters.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/libps/filters.c b/libps/filters.c
index 0dff3dfa..345e90e8 100644
--- a/libps/filters.c
+++ b/libps/filters.c
@@ -23,6 +23,7 @@
#include <stdlib.h>
#include <assert.h>
#include <pwd.h>
+#include <unistd.h>
#include "ps.h"
#include "common.h"