diff --git a/src/libratbag-util.h b/src/libratbag-util.h
index abf699fd..93897c60 100644
--- a/src/libratbag-util.h
+++ b/src/libratbag-util.h
@@ -24,6 +24,7 @@
 #ifndef LIBRATBAG_UTIL_H
 #define LIBRATBAG_UTIL_H
 
+#include <stdlib.h>
 #include <unistd.h>
 #include <libudev.h>