diff --git a/vendor/adb/sysdeps.h b/vendor/adb/sysdeps.h
index 316afe7..8d5da69 100644
--- a/vendor/adb/sysdeps.h
+++ b/vendor/adb/sysdeps.h
@@ -514,7 +514,11 @@ static inline int adb_gethostname(char* name, size_t len) {
 }
 
 static inline int adb_getlogin_r(char* buf, size_t bufsize) {
-    return getlogin_r(buf, bufsize);
+    char* logname = getlogin();
+    if (!logname) return ENXIO;
+    if (strlen(logname) >= bufsize) return ERANGE;
+    strcpy(buf, logname);
+    return 0;
 }
 
 static inline int adb_read(borrowed_fd fd, void* buf, size_t len) {