diff --git a/Makefile b/Makefile
index d692005..9ed6e2d 100644
--- a/Makefile
+++ b/Makefile
@@ -228,7 +228,7 @@ $(BUILD_DIR)/disk-daily$(EXTENSION): disk.rrd
 		AREA:bfsused#$(DANGER):"utilisé":STACK \
 		GPRINT:pfsused2:"%3.2lf %%" \
 		AREA:bfsfree#$(SUCCESS):"libre":STACK \
-		GPRINT:pfsused2:"%4.0lf %So"
+		GPRINT:avgbfsfree:"%4.0lf %So"
 
 $(BUILD_DIR)/disk-weekly$(EXTENSION): disk.rrd
 	rrdtool graph $@ --imgformat $(FORMAT) --end now --start end-$(WEEK_IN_SECS) \
@@ -244,7 +244,7 @@ $(BUILD_DIR)/disk-weekly$(EXTENSION): disk.rrd
 		AREA:bfsused#$(DANGER):"utilisé":STACK \
 		GPRINT:pfsused2:"%3.2lf %%" \
 		AREA:bfsfree#$(SUCCESS):"libre":STACK \
-		GPRINT:pfsused2:"%4.0lf %So"
+		GPRINT:avgbfsfree:"%4.0lf %So"
 
 $(BUILD_DIR)/disk-monthly$(EXTENSION): disk.rrd
 	rrdtool graph $@ --imgformat $(FORMAT) --end now --start end-$(MONTH_IN_SECS) \
@@ -260,7 +260,7 @@ $(BUILD_DIR)/disk-monthly$(EXTENSION): disk.rrd
 		AREA:bfsused#$(DANGER):"utilisé":STACK \
 		GPRINT:pfsused2:"%3.2lf %%" \
 		AREA:bfsfree#$(SUCCESS):"libre":STACK \
-		GPRINT:pfsused2:"%4.0lf %So"
+		GPRINT:avgbfsfree:"%4.0lf %So"