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-rw-r--r--source4/scripting/ejs/smbcalls_string.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/source4/scripting/ejs/smbcalls_string.c b/source4/scripting/ejs/smbcalls_string.c
index 6597f3b27b..46369cdee7 100644
--- a/source4/scripting/ejs/smbcalls_string.c
+++ b/source4/scripting/ejs/smbcalls_string.c
@@ -198,7 +198,7 @@ static int ejs_sprintf(MprVarHandle eid, int argc, struct MprVar **argv)
len_count = count_chars(fmt2, '*');
/* find the type string */
tstr = &fmt2[len];
- while (tstr > fmt2 && isalpha(tstr[-1])) {
+ while (tstr > fmt2 && isalpha((unsigned char)tstr[-1])) {
tstr--;
}
if (strcmp(tstr, "%") == 0) {