3 files changed, 3 insertions, 3 deletions
diff --git a/src/sp-guide.cpp b/src/sp-guide.cpp
index 6cdc75c41..6a71cf4f0 100644
--- a/src/sp-guide.cpp
+++ b/src/sp-guide.cpp
@@ -440,7 +440,7 @@ void sp_guide_set_normal(SPGuide &guide, Geom::Point const normal_to_line, bool
 */
 }
 
-void sp_guide_set_color(SPGuide &guide, const unsigned char r, const unsigned char g, const unsigned char b, bool const commit)
+void sp_guide_set_color(SPGuide &guide, const unsigned r, const unsigned g, const unsigned b, bool const commit)
 {
     g_assert(SP_IS_GUIDE(&guide));
     guide.color = (r << 24) | (g << 16) | (b << 8) | 0x7f;
diff --git a/src/sp-guide.h b/src/sp-guide.h
index 5d2a05791..319e12305 100644
--- a/src/sp-guide.h
+++ b/src/sp-guide.h
@@ -65,7 +65,7 @@ void sp_guide_delete_all_guides(SPDesktop *dt);
 void sp_guide_moveto(SPGuide &guide, Geom::Point const point_on_line, bool const commit);
 void sp_guide_set_normal(SPGuide &guide, Geom::Point const normal_to_line, bool const commit);
 void sp_guide_set_label(SPGuide &guide, const char* label, bool const commit);
-void sp_guide_set_color(SPGuide &guide, const unsigned char r, const unsigned char g, const unsigned char b, bool const commit);
+void sp_guide_set_color(SPGuide &guide, const unsigned r, const unsigned g, const unsigned b, bool const commit);
 void sp_guide_remove(SPGuide *guide);
 
 char *sp_guide_description(SPGuide const *guide, const bool verbose = true);
diff --git a/src/ui/dialog/guides.cpp b/src/ui/dialog/guides.cpp
index 088290b6f..ce21f9c6e 100644
--- a/src/ui/dialog/guides.cpp
+++ b/src/ui/dialog/guides.cpp
@@ -71,7 +71,7 @@ void GuidelinePropertiesDialog::showDialog(SPGuide *guide, SPDesktop *desktop) {
 void GuidelinePropertiesDialog::_colorChanged()
 {
     const Gdk::Color c = _color.get_color();
-    char r = c.get_red()/257, g = c.get_green()/257, b = c.get_blue()/257;
+    unsigned r = c.get_red()/257, g = c.get_green()/257, b = c.get_blue()/257;
     //TODO: why 257? verify this!
     sp_guide_set_color(*_guide, r, g, b, true);
 }