diff --git a/src/Theme.cpp b/src/Theme.cpp
index 749840eaa..4ca02a08a 100644
--- a/src/Theme.cpp
+++ b/src/Theme.cpp
@@ -290,7 +290,7 @@ ThemeBase::~ThemeBase(void)
 {
 }
 
-char * ThemeNames [] =
+const char * ThemeNames [] =
 {  "Classic",
    "Dark",
    "Light",