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-rw-r--r--src/backend/utils/init/postinit.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/backend/utils/init/postinit.c b/src/backend/utils/init/postinit.c
index 304be047892..f5a6a671349 100644
--- a/src/backend/utils/init/postinit.c
+++ b/src/backend/utils/init/postinit.c
@@ -442,7 +442,7 @@ pg_split_opts(char **argv, int *argcp, char *optstr)
*/
while (*optstr)
{
- if (isspace(*optstr) && !last_was_escape)
+ if (isspace((unsigned char) *optstr) && !last_was_escape)
break;
if (!last_was_escape && *optstr == '\\')