diff --git a/src/flutter_pty_unix.c b/src/flutter_pty_unix.c
index 5ee4f80..8e6326e 100644
--- a/src/flutter_pty_unix.c
+++ b/src/flutter_pty_unix.c
@@ -230,7 +230,7 @@ FFI_PLUGIN_EXPORT int pty_getpid(PtyHandle *handle)
     return handle->pid;
 }
 
-FFI_PLUGIN_EXPORT char *pty_error()
+FFI_PLUGIN_EXPORT char *pty_error(void)
 {
     return NULL;
 }