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-rw-r--r--source4/utils/nmblookup.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/source4/utils/nmblookup.c b/source4/utils/nmblookup.c
index 900d55d6df..c8490d08e6 100644
--- a/source4/utils/nmblookup.c
+++ b/source4/utils/nmblookup.c
@@ -49,7 +49,7 @@ static const char *clean_name(TALLOC_CTX *mem_ctx, const char *name)
char *ret = talloc_strdup(mem_ctx, name);
int i;
for (i=0;ret[i];i++) {
- if (!isprint(ret[i])) ret[i] = '.';
+ if (!isprint((unsigned char)ret[i])) ret[i] = '.';
}
return ret;
}