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-rw-r--r--common/util.cpp2
1 files changed, 1 insertions, 1 deletions
diff --git a/common/util.cpp b/common/util.cpp
index e5ab3d22ba..e761e3fa01 100644
--- a/common/util.cpp
+++ b/common/util.cpp
@@ -138,7 +138,7 @@ String tag2string(uint32 tag) {
str[4] = '\0';
// Replace non-printable chars by dot
for (int i = 0; i < 4; ++i) {
- if (!isprint(str[i]))
+ if (!isprint((unsigned char)str[i]))
str[i] = '.';
}
return Common::String(str);