diff --git a/include/verilated.mk.in b/include/verilated.mk.in
index 317d44813..a38afe987 100644
--- a/include/verilated.mk.in
+++ b/include/verilated.mk.in
@@ -80,6 +80,7 @@ VK_CPPFLAGS_ALWAYS += \
 		-I$(VERILATOR_ROOT)/include/vltstd \
 		-DVM_COVERAGE=$(VM_COVERAGE) \
 		-DVM_SC=$(VM_SC) \
+		-DVM_TIMING=$(VM_TIMING) \
 		-DVM_TRACE=$(VM_TRACE) \
 		-DVM_TRACE_FST=$(VM_TRACE_FST) \
 		-DVM_TRACE_VCD=$(VM_TRACE_VCD) \