diff --git a/src/test/csrc/verilator/emu.cpp b/src/test/csrc/verilator/emu.cpp
index 138822614..1ec4edc1c 100644
--- a/src/test/csrc/verilator/emu.cpp
+++ b/src/test/csrc/verilator/emu.cpp
@@ -734,7 +734,9 @@ void Emulator::snapshot_load(const char *filename) {
 
 void Emulator::fork_child_init() {
 #if EMU_THREAD > 1
-#ifdef VERILATOR_4_210
+#if VERILATOR_VERSION_INTEGER >= 4228000
+  dut_ptr->vlSymsp->__Vm_threadPoolp = new VlThreadPool(dut_ptr->contextp(), EMU_THREAD - 1);
+#elif VERILATOR_VERSION_INTEGER >= 4210000
   dut_ptr->vlSymsp->__Vm_threadPoolp = new VlThreadPool(dut_ptr->contextp(), EMU_THREAD - 1, 0);
 #else
   dut_ptr->__Vm_threadPoolp = new VlThreadPool(dut_ptr->contextp(), EMU_THREAD - 1, 0);
diff --git a/verilator.mk b/verilator.mk
index 91b9424bf..cd3ee795c 100644
--- a/verilator.mk
+++ b/verilator.mk
@@ -42,9 +42,10 @@ endif
 
 # Verilator version check
 VERILATOR_VER_CMD = verilator --version | cut -f2 -d' ' | tr -d '.'
+VERILATOR_VERSION = $(shell `$(VERILATOR_VER_CMD)`)
+
 VERILATOR_4_210 := $(shell expr `$(VERILATOR_VER_CMD)` \>= 4210)
 ifeq ($(VERILATOR_4_210),1)
-EMU_CXXFLAGS += -DVERILATOR_4_210
 VEXTRA_FLAGS += --instr-count-dpi 1
 endif
 VERILATOR_5_000 := $(shell expr `$(VERILATOR_VER_CMD)` \>= 5000)