diff --git a/aegisub/Makefile.am b/aegisub/Makefile.am
index e1bda7709..027ad0c89 100644
--- a/aegisub/Makefile.am
+++ b/aegisub/Makefile.am
@@ -54,7 +54,6 @@ EXTRA_DIST = \
 # m4macros/
 EXTRA_DIST += \
 	m4macros/check_gnu_make.m4 \
-	m4macros/boost.m4 \
 	m4macros/acx_pthread.m4 \
 	m4macros/ac_agi.m4 \
 	m4macros/ax_lang_compiler_ms.m4 \