diff --git a/src/pipe/modules/pick/main.c b/src/pipe/modules/pick/main.c
index 337d7a43..9f273134 100644
--- a/src/pipe/modules/pick/main.c
+++ b/src/pipe/modules/pick/main.c
@@ -274,9 +274,9 @@ void write_sink(
     if(show == 2)
     {
       const float d = _cie_de76(picked+3*k, ref+3*k);
-      picked[3*k+0] -= ref[3*k+0];
-      picked[3*k+1] -= ref[3*k+1];
-      picked[3*k+2] -= ref[3*k+2];
+      picked[3*k+0] = fabsf(picked[3*k+0] - ref[3*k+0]);
+      picked[3*k+1] = fabsf(picked[3*k+1] - ref[3*k+1]);
+      picked[3*k+2] = fabsf(picked[3*k+2] - ref[3*k+2]);
       if(d < de76[1])
       {
         // mi = k;