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-rw-r--r--test/ecstresstest.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/test/ecstresstest.c b/test/ecstresstest.c
index 7c76f02108..b47095cba0 100644
--- a/test/ecstresstest.c
+++ b/test/ecstresstest.c
@@ -109,7 +109,7 @@ static int atoi64(const char *in, int64_t *result)
for ( ; *in != '\0'; in++) {
char c = *in;
- if (!isdigit(c))
+ if (!isdigit((unsigned char)c))
return 0;
ret *= 10;
ret += (c - '0');