diff --git a/pr/sol/GNUmakefile b/pr/sol/GNUmakefile
index 3e9b3f9..c526c42 100644
--- a/pr/sol/GNUmakefile
+++ b/pr/sol/GNUmakefile
@@ -12,7 +12,7 @@ all: \
 
 
 %.ppm: %.pov
-	$(POVRAY) +L$(POVINC) +V -I$< +D +FP
+	$(POVRAY) +L$(POVINC) +V -I$< +FP
 
 %.pov: make%
 	$< > $@