diff --git a/Makefile b/Makefile
index e928dcc..b3bf45c 100644
--- a/Makefile
+++ b/Makefile
@@ -13,8 +13,8 @@ starfield:	starfield.f90 Makefile genplotting.o
 
 starfield.png:	starfield Makefile
 	./starfield
-	genplot2 -s 512x512 WS/starfield.scratch a.tga
-	convert a.tga $@
+	genplot2 -s 512x512 WS/starfield.scratch WS/a.tga
+	convert WS/a.tga $@
 
 # -----------------------------------------------
 
@@ -23,8 +23,8 @@ randomwalk:	randomwalk.f90 Makefile genplotting.o
 
 randomwalk.png:	randomwalk Makefile
 	./randomwalk
-	genplot2 -s 512x512 WS/randomwalk.scratch a.tga
-	convert a.tga $@
+	genplot2 -s 512x512 WS/randomwalk.scratch WS/a.tga
+	convert WS/a.tga $@
 
 # -----------------------------------------------
 
@@ -33,8 +33,8 @@ oscilloscope:	oscilloscope.f90 Makefile genplotting.o
 
 oscilloscope.png:	oscilloscope Makefile
 	./oscilloscope
-	genplot2 -s 512x512 WS/oscilloscope.scratch a.tga
-	convert a.tga $@
+	genplot2 -s 512x512 WS/oscilloscope.scratch WS/a.tga
+	convert WS/a.tga $@
 
 # -----------------------------------------------
 
@@ -43,8 +43,8 @@ spirale:	spirale.f90 Makefile genplotting.o
 
 spirale.png:	spirale Makefile
 	./spirale
-	genplot2 -s 512x512 WS/spirale.scratch a.tga
-	convert a.tga $@
+	genplot2 -s 512x512 WS/spirale.scratch WS/a.tga
+	convert WS/a.tga $@
 
 # -----------------------------------------------
 
@@ -53,7 +53,7 @@ lissajous:	lissajous.f90 Makefile genplotting.o
 
 lissajous.png:	lissajous Makefile
 	./lissajous
-	genplot2 -s 512x512 WS/lissajous.scratch a.tga
-	convert a.tga $@
+	genplot2 -s 512x512 WS/lissajous.scratch WS/a.tga
+	convert WS/a.tga $@
 
 # -----------------------------------------------