diff --git a/libsrc/geos/devel/Makefile b/libsrc/geos/devel/Makefile
index ebe4e2a7a..b763ac5eb 100644
--- a/libsrc/geos/devel/Makefile
+++ b/libsrc/geos/devel/Makefile
@@ -16,7 +16,7 @@
 %.tgi:	%.o ../../runtime/zeropage.o
 	@$(LD) -t module -o $@ $^
 
-S_OBJS	= crt0.o geoszp.o oserror.o oserrlist.o randomize.o fio_module.o tgi_mode_table.o
+S_OBJS	= crt0.o extzp.o oserror.o oserrlist.o randomize.o fio_module.o tgi_mode_table.o
 
 #--------------------------------------------------------------------------
 # Drivers