diff --git a/libobs/util/platform-nix.c b/libobs/util/platform-nix.c
index e6cf1027d..d91ddd66f 100644
--- a/libobs/util/platform-nix.c
+++ b/libobs/util/platform-nix.c
@@ -38,6 +38,7 @@
 #include <sys/param.h>
 #include <sys/queue.h>
 #include <sys/socket.h>
+#include <sys/sysctl.h>
 #include <sys/user.h>
 #include <unistd.h>
 #include <libprocstat.h>