diff --git a/libc/src/unistd/getopt.cpp b/libc/src/unistd/getopt.cpp
index 6da47e73926cc..84b962d0cdda8 100644
--- a/libc/src/unistd/getopt.cpp
+++ b/libc/src/unistd/getopt.cpp
@@ -191,9 +191,9 @@ static GetoptContext ctx{&impl::optarg, &impl::optind, &impl::optopt,
 
 #ifndef LIBC_COPT_PUBLIC_PACKAGING
 // This is used exclusively in tests.
-void set_getopt_state(char **optarg, int *optind, int *optopt, unsigned *optpos,
-                      int *opterr, FILE *errstream) {
-  ctx = {optarg, optind, optopt, optpos, opterr, errstream};
+void set_getopt_state(char **optarg_in, int *optind_in, int *optopt_in,
+                      unsigned *optpos_in, int *opterr_in, FILE *errstream) {
+  ctx = {optarg_in, optind_in, optopt_in, optpos_in, opterr_in, errstream};
 }
 #endif