diff --git a/ext/ffmpeg/Makefile.am b/ext/ffmpeg/Makefile.am
index 04aad29eac..fef3225f11 100644
--- a/ext/ffmpeg/Makefile.am
+++ b/ext/ffmpeg/Makefile.am
@@ -10,8 +10,8 @@ libgstffmpeg_la_SOURCES = gstffmpeg.c 		\
 			  gstffmpegprotocol.c
 
 libgstffmpeg_la_CFLAGS = $(GST_CFLAGS) \
-	-I $(top_builddir)/gst-libs/ext/ffmpeg/ffmpeg/libavcodec \
-	-I $(top_builddir)/gst-libs/ext/ffmpeg/ffmpeg/libavformat
+	-I $(top_srcdir)/gst-libs/ext/ffmpeg/ffmpeg/libavcodec \
+	-I $(top_srcdir)/gst-libs/ext/ffmpeg/ffmpeg/libavformat
 libgstffmpeg_la_LIBADD = \
 	$(top_builddir)/gst-libs/ext/ffmpeg/libavcodec.la \
 	$(top_builddir)/gst-libs/ext/ffmpeg/libavformat.la