diff --git a/Makefile.am b/Makefile.am
index 91f4eee..1eeb988 100644
--- a/Makefile.am
+++ b/Makefile.am
@@ -163,6 +163,7 @@ cglm_struct_HEADERS = include/cglm/struct/mat4.h \
                       include/cglm/struct/mat2.h \
                       include/cglm/struct/affine-pre.h \
                       include/cglm/struct/affine-post.h \
+                      include/cglm/struct/affine-mat.h \
                       include/cglm/struct/affine.h \
                       include/cglm/struct/affine2d.h \
                       include/cglm/struct/vec2.h \