diff --git a/src/GUI/ColorScheme/Solarized.hpp b/src/GUI/ColorScheme/Solarized.hpp
index 1cc224ce4..e1aaf456a 100644
--- a/src/GUI/ColorScheme/Solarized.hpp
+++ b/src/GUI/ColorScheme/Solarized.hpp
@@ -12,30 +12,30 @@ namespace Slic3r { namespace GUI {
 /// Implements a colorscheme lookup of wxColors
 class Solarized : public ColorScheme {
 public:
-    const wxColour SELECTED_COLOR() { return COLOR_MAGENTA; }
-    const wxColour HOVER_COLOR() { return COLOR_VIOLET; }
-    const wxColour SUPPORT_COLOR() { return COLOR_VIOLET; }
+    const wxColour SELECTED_COLOR() const { return COLOR_MAGENTA; }
+    const wxColour HOVER_COLOR() const { return COLOR_VIOLET; }
+    const wxColour SUPPORT_COLOR() const { return COLOR_VIOLET; }
 
-    const wxColour BACKGROUND_COLOR() { return COLOR_BASE3; }
+    const wxColour BACKGROUND_COLOR() const { return COLOR_BASE3; }
 
 
 private:
-    const wxColour COLOR_BASE0    {wxColour(255*0.51373,255*0.58039,255*0.58824)};
-    const wxColour COLOR_BASE00   {wxColour(255*0.39608,255*0.48235,255*0.51373)};
-    const wxColour COLOR_BASE01   {wxColour(255*0.34510,255*0.43137,255*0.45882)};
-    const wxColour COLOR_BASE02   {wxColour(255*0.02745,255*0.21176,255*0.25882)};
-    const wxColour COLOR_BASE03   {wxColour(255*0.00000,255*0.16863,255*0.21176)};
-    const wxColour COLOR_BASE1    {wxColour(255*0.57647,255*0.63137,255*0.63137)};
-    const wxColour COLOR_BASE2    {wxColour(255*0.93333,255*0.90980,255*0.83529)};
-    const wxColour COLOR_BASE3    {wxColour(255*0.99216,255*0.96471,255*0.89020)};
-    const wxColour COLOR_BLUE     {wxColour(255*0.14902,255*0.54510,255*0.82353)};
-    const wxColour COLOR_CYAN     {wxColour(255*0.16471,255*0.63137,255*0.59608)};
-    const wxColour COLOR_GREEN    {wxColour(255*0.52157,255*0.60000,255*0.00000)};
-    const wxColour COLOR_MAGENTA  {wxColour(255*0.82745,255*0.21176,255*0.50980)};
-    const wxColour COLOR_ORANGE   {wxColour(255*0.79608,255*0.29412,255*0.08627)};
-    const wxColour COLOR_RED      {wxColour(255*0.86275,255*0.19608,255*0.18431)};
-    const wxColour COLOR_VIOLET   {wxColour(255*0.42353,255*0.44314,255*0.76863)};
-    const wxColour COLOR_YELLOW   {wxColour(255*0.70980,255*0.53725,255*0.00000)};
+    const wxColour COLOR_BASE0    const {wxColour(255*0.51373,255*0.58039,255*0.58824)};
+    const wxColour COLOR_BASE00   const {wxColour(255*0.39608,255*0.48235,255*0.51373)};
+    const wxColour COLOR_BASE01   const {wxColour(255*0.34510,255*0.43137,255*0.45882)};
+    const wxColour COLOR_BASE02   const {wxColour(255*0.02745,255*0.21176,255*0.25882)};
+    const wxColour COLOR_BASE03   const {wxColour(255*0.00000,255*0.16863,255*0.21176)};
+    const wxColour COLOR_BASE1    const {wxColour(255*0.57647,255*0.63137,255*0.63137)};
+    const wxColour COLOR_BASE2    const {wxColour(255*0.93333,255*0.90980,255*0.83529)};
+    const wxColour COLOR_BASE3    const {wxColour(255*0.99216,255*0.96471,255*0.89020)};
+    const wxColour COLOR_BLUE     const {wxColour(255*0.14902,255*0.54510,255*0.82353)};
+    const wxColour COLOR_CYAN     const {wxColour(255*0.16471,255*0.63137,255*0.59608)};
+    const wxColour COLOR_GREEN    const {wxColour(255*0.52157,255*0.60000,255*0.00000)};
+    const wxColour COLOR_MAGENTA  const {wxColour(255*0.82745,255*0.21176,255*0.50980)};
+    const wxColour COLOR_ORANGE   const {wxColour(255*0.79608,255*0.29412,255*0.08627)};
+    const wxColour COLOR_RED      const {wxColour(255*0.86275,255*0.19608,255*0.18431)};
+    const wxColour COLOR_VIOLET   const {wxColour(255*0.42353,255*0.44314,255*0.76863)};
+    const wxColour COLOR_YELLOW   const {wxColour(255*0.70980,255*0.53725,255*0.00000)};
 
 };
 }} // namespace Slic3r::GUI