diff --git a/tests/test_basic/Makefile b/tests/test_basic/Makefile
index 045d55b..015e3ad 100644
--- a/tests/test_basic/Makefile
+++ b/tests/test_basic/Makefile
@@ -10,6 +10,7 @@ SOURCE_AS = $(wildcard *.S)
 OBJ = $(notdir $(SOURCE_AS:.S=.o))
 OBJ += $(notdir $(SOURCE_C:.c=.o))
 
+# Software compilation
 CC = riscv64-linux-gnu-gcc
 CFLAGS = -march=rv32i -mabi=ilp32
 
@@ -21,7 +22,6 @@ ASFLAGS = -march=rv32i -mabi=ilp32
 LD = riscv64-linux-gnu-ld
 LDFLAGS = -melf32lriscv_ilp32
 
-
 # $(info $$TESTBENCH_V is [${TESTBENCH_V}])
 # $(info $$SOURCE_V is [${SOURCE_V}])
 # $(info $$LOGS is [${LOGS}])
@@ -29,7 +29,6 @@ LDFLAGS = -melf32lriscv_ilp32
 # $(info $$SOURCE_AS is [${SOURCE_AS}])
 # $(info $$OBJ is [${OBJ}])
 
-
 %.o: %.S
 	$(AS) $(ASFLAGS) $^ -o $@
 
@@ -43,9 +42,11 @@ LDFLAGS = -melf32lriscv_ilp32
 %.hex: %.elf
 	riscv64-linux-gnu-objcopy --target=verilog $< $@
 
+# Hardware compilation
 %.out: %.sv $(SOURCE_V)
-	iverilog -o $@ $^
+	iverilog -g2012 -o $@ $^
 
+# Run test
 %.vcd %.log: %.out %.hex
 	./$< | tee $(patsubst %.out, %.log, $<)
 
@@ -60,4 +61,3 @@ clean:
 
 .SECONDARY: %.log %.vcd
 .PHONY: all clean verify
-
diff --git a/tests/test_c/Makefile b/tests/test_c/Makefile
index 949d1a5..d4fb01a 100644
--- a/tests/test_c/Makefile
+++ b/tests/test_c/Makefile
@@ -48,7 +48,7 @@ LDFLAGS = -melf32lriscv_ilp32
 	riscv64-linux-gnu-objcopy --target=verilog $< $@
 
 %.out: %.sv $(SOURCE_V)
-	iverilog -o $@ $^
+	iverilog -g2012 -o $@ $^
 
 %.vcd %.log: %.out %.hex
 	./$< | tee $(patsubst %.out, %.log, $<)