diff --git a/src/detection/initsystem/initsystem_linux.c b/src/detection/initsystem/initsystem_linux.c
index 2a7df1b59..3bfa03509 100644
--- a/src/detection/initsystem/initsystem_linux.c
+++ b/src/detection/initsystem/initsystem_linux.c
@@ -3,6 +3,7 @@
 #include "util/binary.h"
 #include "util/stringUtils.h"
 
+#include <libgen.h>
 #include <unistd.h>
 
 FF_MAYBE_UNUSED static bool extractSystemdVersion(const char* str, uint32_t len, void* userdata)