diff --git a/lib/libdvbsub/Makefile.am b/lib/libdvbsub/Makefile.am
index 1b1c86400..31010176f 100644
--- a/lib/libdvbsub/Makefile.am
+++ b/lib/libdvbsub/Makefile.am
@@ -4,7 +4,9 @@ AM_CPPFLAGS = \
 	-I$(top_srcdir)/src \
 	-I$(top_srcdir)/src/zapit/include
 
-AM_CPPFLAGS += @HWLIB_CFLAGS@
+AM_CPPFLAGS +=\
+	@HWLIB_CFLAGS@ \
+	@AVFORMAT_CFLAGS@
 
 AM_CPPFLAGS += -fno-rtti -fno-exceptions
 
diff --git a/src/gui/Makefile.am b/src/gui/Makefile.am
index 55f8d1c1e..ed220d62f 100644
--- a/src/gui/Makefile.am
+++ b/src/gui/Makefile.am
@@ -31,6 +31,7 @@ AM_CPPFLAGS += \
 	@CURL_CFLAGS@ \
 	@LUA_CFLAGS@ \
 	@FREETYPE_CFLAGS@ \
+	@AVFORMAT_CFLAGS@ \
 	@HWLIB_CFLAGS@
 
 noinst_LIBRARIES = libtimerlist.a libneutrino_gui.a libneutrino_gui2.a