diff --git a/aegisub/acinclude.m4 b/aegisub/acinclude.m4
index 7273a9f29..9ffe0ce65 100644
--- a/aegisub/acinclude.m4
+++ b/aegisub/acinclude.m4
@@ -5,5 +5,4 @@ m4_include([m4macros/acx_pthread.m4])
 m4_include([m4macros/ax_check_gl.m4])
 m4_include([m4macros/ax_lang_compiler_ms.m4])
 m4_include([m4macros/ax_openmp.m4])
-m4_include([m4macros/boost.m4])
 m4_include([m4macros/check_gnu_make.m4])