diff --git a/make/textest.mk b/make/textest.mk
index b6b20d3a..d15754d8 100644
--- a/make/textest.mk
+++ b/make/textest.mk
@@ -28,7 +28,7 @@ $(OUT_PDF): $(SOURCES)
 	touch $@
 
 $(OUT_PNG): $(OUT_PDF)
-	convert -density 400 -scale x100 $< $@
+	convert -density 400 -scale x$(PNG_WIDTH) $< $@
 
 clean.files:
 	rm -rf *.done *.aux *.log *.pdf *.nav *.out *.snm *.toc .*.swp $(OUT_PNG)