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-rw-r--r--engines/sci/graphics/text16.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/engines/sci/graphics/text16.cpp b/engines/sci/graphics/text16.cpp
index c2f71a0e54..84547d9828 100644
--- a/engines/sci/graphics/text16.cpp
+++ b/engines/sci/graphics/text16.cpp
@@ -100,7 +100,7 @@ int16 GfxText16::CodeProcessing(const char *&text, GuiResourceId orgFontId, int1
// cX -> sets textColor to _textColors[X-1]
curCode = textCode[0];
curCodeParm = textCode[1];
- if (isdigit(curCodeParm)) {
+ if (isdigit(static_cast<unsigned char>(curCodeParm))) {
curCodeParm -= '0';
} else {
curCodeParm = -1;