--- a/src/bin/psql/command.c
+++ b/src/bin/psql/command.c
@@ -1350,7 +1350,7 @@ exec_command(const char *cmd,
                         char       *newval;

                         newval = psprintf("%s=%s", envvar, envval);
-                       putenv(newval);
+                       pg_putenv_proxy(newval);
                         success = true;

                         /*