--- a/coreutils/df.c
+++ b/coreutils/df.c
@@ -53,8 +53,8 @@ int df_main(int argc, char **argv)
 		OPT_ALL   = (1 << 2) * ENABLE_FEATURE_DF_FANCY,
 		OPT_INODE = (1 << 3) * ENABLE_FEATURE_DF_FANCY,
 		OPT_BSIZE = (1 << 4) * ENABLE_FEATURE_DF_FANCY,
-		OPT_HUMAN = (1 << 5) * ENABLE_FEATURE_HUMAN_READABLE,
-		OPT_MEGA  = (1 << 6) * ENABLE_FEATURE_HUMAN_READABLE,
+		OPT_HUMAN = (1 << (2 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
+		OPT_MEGA  = (1 << (3 + 3*ENABLE_FEATURE_DF_FANCY)) * ENABLE_FEATURE_HUMAN_READABLE,
 	};
 	const char *disp_units_hdr = NULL;
 	char *chp;