diff --git a/src/Makefile.am b/src/Makefile.am
index c2764adb..c4e2e37e 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -5,7 +5,7 @@ libwebpdecode_la_SOURCES = webp/decode.h webp/vp8.h \
   dec/bits.h dec/vp8i.h dec/yuv.h dec/bits.c dec/dsp.c dec/frame.c \
   dec/quant.c dec/tree.c dec/vp8.c dec/webp.c dec/yuv.c
 libwebpdecode_la_LDFLAGS = -version-info 0:0:0
-libwebpdecodeinclude_HEADERS = webp/decode.h webp/decode_vp8.h
+libwebpdecodeinclude_HEADERS = webp/decode.h webp/decode_vp8.h webp/types.h
 libwebpdecodeincludedir = $(includedir)/webp
 
 noinst_HEADERS = dec/bits.h dec/vp8i.h dec/yuv.h
diff --git a/src/Makefile.in b/src/Makefile.in
index bcc202ef..34ba62d8 100644
--- a/src/Makefile.in
+++ b/src/Makefile.in
@@ -214,7 +214,7 @@ libwebpdecode_la_SOURCES = webp/decode.h webp/vp8.h \
   dec/quant.c dec/tree.c dec/vp8.c dec/webp.c dec/yuv.c
 
 libwebpdecode_la_LDFLAGS = -version-info 0:0:0
-libwebpdecodeinclude_HEADERS = webp/decode.h webp/decode_vp8.h
+libwebpdecodeinclude_HEADERS = webp/decode.h webp/decode_vp8.h webp/types.h
 libwebpdecodeincludedir = $(includedir)/webp
 noinst_HEADERS = dec/bits.h dec/vp8i.h dec/yuv.h
 all: all-am