diff --git a/libfprint/drivers_api.h b/libfprint/drivers_api.h
index 2679c77..cc844cd 100644
--- a/libfprint/drivers_api.h
+++ b/libfprint/drivers_api.h
@@ -30,6 +30,8 @@
 
 #include <stdint.h>
 #include <errno.h>
+#include <string.h>
+#include <stdlib.h>
 #include <glib.h>
 #include <libusb.h>