diff --git a/rtengine/iplab2rgb.cc b/rtengine/iplab2rgb.cc
index f07601c45..5e14d6cad 100644
--- a/rtengine/iplab2rgb.cc
+++ b/rtengine/iplab2rgb.cc
@@ -513,7 +513,7 @@ void ImProcFunctions::workingtrc(const Imagefloat* src, Imagefloat* dst, int cw,
         bluxx = 0.55f * (blugraphx + 1.f) - 0.1f;
         bluxx = rtengine::LIM(bluxx, -0.1f, 0.5f);
         bluyy = 0.55f * (blugraphy + 1.f) - 0.1f;
-        bluyy = rtengine::LIM(bluyy, -0.1f, 0.5f);
+        bluyy = rtengine::LIM(bluyy, -0.1f, 0.49f);
         grexx = 0.55f * (gregraphx + 1.f) - 0.1f;
         grexx = rtengine::LIM(grexx, -0.1f, 0.4f);
         greyy = 0.55f * (gregraphy + 1.f) - 0.1f;
diff --git a/rtgui/icmpanel.cc b/rtgui/icmpanel.cc
index c52807497..45d0f6622 100644
--- a/rtgui/icmpanel.cc
+++ b/rtgui/icmpanel.cc
@@ -305,7 +305,7 @@ ICMPanel::ICMPanel() : FoldableToolPanel(this, "icm", M("TP_ICM_LABEL")), iuncha
     setExpandAlignProperties(grey, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_CENTER);
     blux = Gtk::manage(new Adjuster(M("TC_PRIM_BLUX"), -0.1, 0.4, 0.0001, 0.0366));
     setExpandAlignProperties(blux, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_CENTER);
-    bluy = Gtk::manage(new Adjuster(M("TC_PRIM_BLUY"), -0.1, 0.5, 0.0001, 0.0001));
+    bluy = Gtk::manage(new Adjuster(M("TC_PRIM_BLUY"), -0.1, 0.49, 0.0001, 0.0001));
     setExpandAlignProperties(bluy, true, false, Gtk::ALIGN_FILL, Gtk::ALIGN_CENTER);
 
     redx->set_tooltip_text(M("TP_ICM_PRIMRED_TOOLTIP"));