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-rw-r--r--extra/config/confdata.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/extra/config/confdata.c b/extra/config/confdata.c
index d3df3ab34..9e413b4a3 100644
--- a/extra/config/confdata.c
+++ b/extra/config/confdata.c
@@ -40,7 +40,7 @@ static char *conf_expand_value(const char *in)
strncat(res_value, in, src - in);
src++;
dst = name;
- while (isalnum(*src) || *src == '_')
+ while (isalnum((int)*src) || *src == '_')
*dst++ = *src++;
*dst = 0;
sym = sym_lookup(name, 0);