diff --git a/src/colors/kcolorutils.cpp b/src/colors/kcolorutils.cpp
--- a/src/colors/kcolorutils.cpp
+++ b/src/colors/kcolorutils.cpp
@@ -57,7 +57,7 @@
     }
     KColorSpaces::KHCY khcy(color);
     *c = khcy.c;
-    *h = khcy.h;
+    *h = khcy.h + (khcy.h < 0.0 ? 1.0 : 0.0);
     *y = khcy.y;
     if (a) {
         *a = khcy.a;