diff --git a/ColorPicker.cpp b/ColorPicker.cpp
index ef5d272..9db0e5c 100644
--- a/ColorPicker.cpp
+++ b/ColorPicker.cpp
@@ -73,7 +73,7 @@
 
 
 // Values from this come up the same as doing:   QColor::fromHsvF(hue, sat, 1.0).rgba()
-uint32_t rgbFromHsvF(qreal h1, qreal s, qreal v, qreal a)
+uint32_t rgbFromHsvF(qreal h1, qreal s, qreal v, qreal /*a*/)
 {
     uint16_t hue = h1 == qreal(-1.0) ? USHRT_MAX : qRound(h1 * 36000);
     h1 = hue == 36000 ? 0 : hue / qreal(6000.);