diff --git a/targettest/accelerator/Makefile b/targettest/accelerator/Makefile
index bcddac1fa..a46ec43c0 100644
--- a/targettest/accelerator/Makefile
+++ b/targettest/accelerator/Makefile
@@ -1,7 +1,3 @@
-# Run 'make SYS=<target>'; or, set a SYS env.
-# var. to build for another target system.
-SYS ?= c64
-
 # Just the usual way to find out if we're
 # using cmd.exe to execute make rules.
 ifneq ($(shell echo),)
@@ -58,18 +54,10 @@ else
 endif
 
 c64-scpu-test.prg: c64-c128-scpu-test.c
-# do not use cl65 to prevent tests from failing randomly because of one process
-# deleting the temp files from another
-#	$(CL) -t c64 c64-c128-scpu-test.c -o c64-scpu-test.prg
-	$(CC) -t c64 c64-c128-scpu-test.c -o c64-scpu-test.s
-	$(CL) -t c64 c64-scpu-test.s -o c64-scpu-test.prg
+	$(CL) -t c64 c64-c128-scpu-test.c -o c64-scpu-test.prg
 
 c128-scpu-test.prg: c64-c128-scpu-test.c
-# do not use cl65 to prevent tests from failing randomly because of one process
-# deleting the temp files from another
-#	$(CL) -t c128 c64-c128-scpu-test.c -o c128-scpu-test.prg
-	$(CC) -t c128 c64-c128-scpu-test.c -o c128-scpu-test.s
-	$(CL) -t c128 c128-scpu-test.s -o c128-scpu-test.prg
+	$(CL) -t c128 c64-c128-scpu-test.c -o c128-scpu-test.prg
 
 c64dtv-test.prg: c64dtv-test.c
 	$(CL) -t c64 c64dtv-test.c -o c64dtv-test.prg
@@ -91,4 +79,3 @@ turbomaster-test.prg: turbomaster-test.c
 
 clean:
 	@$(DEL) *.prg 2>$(NULLDEV)
-	@$(DEL) *.s 2>$(NULLDEV)