diff --git a/aegisub/acinclude.m4 b/aegisub/acinclude.m4
index 47c43921b..4f9e9479e 100644
--- a/aegisub/acinclude.m4
+++ b/aegisub/acinclude.m4
@@ -6,3 +6,4 @@ m4_include([m4macros/ax_pthread.m4])
 m4_include([m4macros/ax_check_gl.m4])
 m4_include([m4macros/ax_lang_compiler_ms.m4])
 m4_include([m4macros/check_gnu_make.m4])
+m4_include([m4macros/wxwin.m4])