diff --git a/src/tmx2gba.cpp b/src/tmx2gba.cpp
index f98a85c..64f5cc4 100644
--- a/src/tmx2gba.cpp
+++ b/src/tmx2gba.cpp
@@ -85,6 +85,7 @@ void GetoptClear ()
 	next = nullptr;
 #else
 	optreset = 1;
+	optind = 1;
 #endif
 }