diff --git a/libfprint/fp_internal.h b/libfprint/fp_internal.h
index 15c7cbd..6d8849b 100644
--- a/libfprint/fp_internal.h
+++ b/libfprint/fp_internal.h
@@ -36,7 +36,7 @@
 #include "assembling.h"
 #include "drivers/driver_ids.h"
 
-#define array_n_elements(array) (sizeof(array) / sizeof(array[0]))
+#define array_n_elements(array) G_N_ELEMENTS(array)
 
 #define container_of(ptr, type, member) ({                      \
         const typeof( ((type *)0)->member ) *__mptr = (ptr);    \