diff --git a/rogueviz/sag/sag.cpp b/rogueviz/sag/sag.cpp
index 9bef7e1e..e953e06a 100644
--- a/rogueviz/sag/sag.cpp
+++ b/rogueviz/sag/sag.cpp
@@ -198,8 +198,8 @@ void auto_orth(bool set_colors) {
     applymodel(M*p, ret);
     auto& col = vdata[i].cp.color1;
     for(int j=0; j<3; j++) {
-      println(hlog, "coloring ", tie(i,j), ret[j], " -> ", ilerp(pmin[j], pmax[j], ret[j]), " -> ", lerp(0, 255, ilerp(pmin[j], pmax[j], ret[j])));
-      part(col, j+1) = lerp(0, 255, ilerp(pmin[j], pmax[j], ret[j]));
+      println(hlog, "coloring ", tie(i,j), ret[j], " -> ", ilerp(pmin[j], pmax[j], ret[j]), " -> ", hr::lerp(0, 255, ilerp(pmin[j], pmax[j], ret[j])));
+      part(col, j+1) = hr::lerp(0, 255, ilerp(pmin[j], pmax[j], ret[j]));
       }
     vdata[i].cp.color2 = col;
     }
diff --git a/rogueviz/som/kohonen.cpp b/rogueviz/som/kohonen.cpp
index 43423f8b..c8fa60ca 100644
--- a/rogueviz/som/kohonen.cpp
+++ b/rogueviz/som/kohonen.cpp
@@ -1408,7 +1408,7 @@ bool draw_heatmap() {
       queuecurve(atscreenpos(0,0), 0, darkena(heatmap(ilerp(width, vid.yres-width, y+pixstep/2.)), 0, 0xFF), PPR::LINE);
       }
     for(int p=0; p<=10; p++) {
-      ld y = lerp(width, vid.yres-width, p / 10.);
+      ld y = hr::lerp(width, vid.yres-width, p / 10.);
       curvepoint(eupoint(width*2, y));
       curvepoint(eupoint(width*3, y));
       queuecurve(atscreenpos(0,0), 0xFFFFFFFF, 0, PPR::LINE);