diff --git a/gst/gl/Makefile.am b/gst/gl/Makefile.am
index 1055b5d9fa..23b0bec3e2 100644
--- a/gst/gl/Makefile.am
+++ b/gst/gl/Makefile.am
@@ -17,7 +17,9 @@ libgstopengl_la_SOURCES = \
 	gstglfiltercube.c \
 	gstglfiltercube.h \
 	gstglfilterapp.c \
-	gstglfilterapp.h
+	gstglfilterapp.h \
+	gstglcolorscale.c \
+	gstglcolorscale.h
 
 # check order of CFLAGS and LIBS, shouldn't the order be the other way around
 # (like in AM_CFLAGS)?