diff --git a/gdal/frmts/vrt/GNUmakefile b/gdal/frmts/vrt/GNUmakefile
index b4e3d2427e16..2340fc25f7c1 100644
--- a/gdal/frmts/vrt/GNUmakefile
+++ b/gdal/frmts/vrt/GNUmakefile
@@ -3,6 +3,7 @@ include ../../GDALmake.opt
 OBJ := vrtdataset.o vrtrasterband.o vrtdriver.o vrtsources.o
 OBJ += vrtfilters.o vrtsourcedrasterband.o vrtrawrasterband.o
 OBJ += vrtwarped.o vrtderivedrasterband.o vrtpansharpened.o
+OBJ += pixelfunctions.o
 
 CPPFLAGS := -I../raw $(CPPFLAGS)