4 files changed, 4 insertions, 4 deletions
diff --git a/src/resources/dye.cpp b/src/resources/dye.cpp
index 4b5c1268c..62be4e09e 100644
--- a/src/resources/dye.cpp
+++ b/src/resources/dye.cpp
@@ -72,7 +72,7 @@ DyePalette::DyePalette(const std::string &description, const int8_t blockSize)
     logger->log("Error, invalid embedded palette: %s", description.c_str());
 }
 
-int DyePalette::hexDecode(const char c)
+int DyePalette::hexDecode(const signed char c)
 {
     if ('0' <= c && c <= '9')
         return c - '0';
diff --git a/src/resources/dye.h b/src/resources/dye.h
index d3960f04c..400010f37 100644
--- a/src/resources/dye.h
+++ b/src/resources/dye.h
@@ -80,7 +80,7 @@ class DyePalette final
          */
         void replaceAOGLColor(uint8_t *const color) const;
 
-        static int hexDecode(const char c);
+        static int hexDecode(const signed char c);
 
     private:
         struct Color
diff --git a/src/resources/itemdb.cpp b/src/resources/itemdb.cpp
index 559015be9..f2e07ce48 100644
--- a/src/resources/itemdb.cpp
+++ b/src/resources/itemdb.cpp
@@ -56,7 +56,7 @@ static void loadOrderSprite(ItemInfo *const itemInfo, const XmlNodePtr node,
 static int parseSpriteName(std::string name);
 static int parseDirectionName(std::string name);
 
-static char const *const fields[][2] =
+static const char *const fields[][2] =
 {
     { "attack",    N_("Attack %+d")    },
     { "defense",   N_("Defense %+d")   },
diff --git a/src/resources/iteminfo.cpp b/src/resources/iteminfo.cpp
index eb85e5c9e..c0fb962c7 100644
--- a/src/resources/iteminfo.cpp
+++ b/src/resources/iteminfo.cpp
@@ -206,7 +206,7 @@ const std::string ItemInfo::replaceColors(std::string str,
 
     str = replaceAll(str, "%color%", name);
     if (!name.empty())
-        name[0] = static_cast<char>(toupper(name[0]));
+        name[0] = static_cast<signed char>(toupper(name[0]));
 
     return replaceAll(str, "%Color%", name);
 }