diff --git a/src/demux/Makefile.am b/src/demux/Makefile.am
index ba9d9474..7e80bdc2 100644
--- a/src/demux/Makefile.am
+++ b/src/demux/Makefile.am
@@ -5,9 +5,12 @@ libwebpdemux_la_SOURCES =
 libwebpdemux_la_SOURCES += anim_decode.c demux.c
 
 libwebpdemuxinclude_HEADERS =
+libwebpdemuxinclude_HEADERS += ../webp/decode.h
 libwebpdemuxinclude_HEADERS += ../webp/demux.h
 libwebpdemuxinclude_HEADERS += ../webp/mux_types.h
 libwebpdemuxinclude_HEADERS += ../webp/types.h
+noinst_HEADERS =
+noinst_HEADERS += ../webp/format_constants.h
 
 libwebpdemux_la_LIBADD = ../libwebp.la
 libwebpdemux_la_LDFLAGS = -no-undefined -version-info 2:4:0
diff --git a/src/mux/Makefile.am b/src/mux/Makefile.am
index 771ff339..447bcce4 100644
--- a/src/mux/Makefile.am
+++ b/src/mux/Makefile.am
@@ -13,6 +13,8 @@ libwebpmuxinclude_HEADERS =
 libwebpmuxinclude_HEADERS += ../webp/mux.h
 libwebpmuxinclude_HEADERS += ../webp/mux_types.h
 libwebpmuxinclude_HEADERS += ../webp/types.h
+noinst_HEADERS =
+noinst_HEADERS += ../webp/format_constants.h
 
 libwebpmux_la_LIBADD = ../libwebp.la
 libwebpmux_la_LDFLAGS = -no-undefined -version-info 3:2:0 -lm