diff --git a/glib/gutils.c b/glib/gutils.c
index 78ccd61..4ecd276 100644
--- a/glib/gutils.c
+++ b/glib/gutils.c
@@ -2751,7 +2751,7 @@ g_nullify_pointer (gpointer *nullify_location)
   *nullify_location = NULL;
 }
 
-#define KILOBYTE_FACTOR (G_GOFFSET_CONSTANT (1000))
+#define KILOBYTE_FACTOR (G_GOFFSET_CONSTANT (1024))
 #define MEGABYTE_FACTOR (KILOBYTE_FACTOR * KILOBYTE_FACTOR)
 #define GIGABYTE_FACTOR (MEGABYTE_FACTOR * KILOBYTE_FACTOR)
 #define TERABYTE_FACTOR (GIGABYTE_FACTOR * KILOBYTE_FACTOR)