diff --git a/dhrystone/Makefile b/dhrystone/Makefile
index 3609a97..9cc191f 100644
--- a/dhrystone/Makefile
+++ b/dhrystone/Makefile
@@ -29,7 +29,7 @@ timing.vvp: testbench.v ../picorv32.v
 	chmod -x timing.vvp
 
 dhry.hex: dhry.elf
-	riscv32-unknown-elf-objcopy -O verilog $< $@
+	$(TOOLCHAIN_PREFIX)objcopy -O verilog $< $@
 
 ifeq ($(USE_MYSTDLIB),1)
 dhry.elf: $(OBJS) sections.lds
diff --git a/dhrystone/testbench.v b/dhrystone/testbench.v
index 2d985d6..b767a9e 100644
--- a/dhrystone/testbench.v
+++ b/dhrystone/testbench.v
@@ -29,6 +29,7 @@ module testbench;
 	picorv32 #(
 		.BARREL_SHIFTER(1),
 		.ENABLE_MUL(1),
+		.ENABLE_FAST_MUL(1),
 		.ENABLE_DIV(1),
 		.PROGADDR_RESET('h10000),
 		.STACKADDR('h10000)