diff --git a/dtool/src/cppparser/cppPreprocessor.h b/dtool/src/cppparser/cppPreprocessor.h
index 0e509e9b1b..a241fc617d 100644
--- a/dtool/src/cppparser/cppPreprocessor.h
+++ b/dtool/src/cppparser/cppPreprocessor.h
@@ -25,7 +25,6 @@
 #include "vector_string.h"
 
 #include <map>
-#include <list>
 #include <vector>
 #include <unordered_map>