diff --git a/src/tools/pw-config.c b/src/tools/pw-config.c
index 48314b186..abdb656e5 100644
--- a/src/tools/pw-config.c
+++ b/src/tools/pw-config.c
@@ -7,6 +7,7 @@
 #include <getopt.h>
 #include <signal.h>
 #include <locale.h>
+#include <unistd.h>
 
 #include <spa/utils/result.h>
 #include <spa/utils/json.h>