diff --git a/IV/Makefile b/IV/Makefile
index 9ca3d6e..5071e54 100644
--- a/IV/Makefile
+++ b/IV/Makefile
@@ -142,8 +142,8 @@ label_vw64 = Visvalingam--Whyatt
 label_dp64 = Douglas \& Peucker
 label_grpk10 = GRPK 1:\numprint{10000}
 label_grpk50 = GRPK 1:\numprint{50000}
-label_vw64chaikin = $(label_vw64) and Chaikin
-label_dp64chaikin = $(label_dp64) and Chaikin
+label_vwchaikin64 = $(label_vw64) and Chaikin
+label_dpchaikin64 = $(label_dp64) and Chaikin
 legend_   = lower left
 legend_tr = lower right
 legend_tl = lower center