diff --git a/hw/simulate/Makefile b/hw/simulate/Makefile
index 307f78afd..20a633358 100644
--- a/hw/simulate/Makefile
+++ b/hw/simulate/Makefile
@@ -47,7 +47,7 @@ VL_FLAGS += verilator.vlt
 VL_FLAGS += --exe $(SRCS) $(RTL_INCLUDE)
 VL_FLAGS += --cc Vortex.v --top-module $(TOP)
 
-// Use FPNEW PFU core
+# Use FPNEW PFU core
 VL_FLAGS += -DFPU_FPNEW
 
 DBG_FLAGS += -DVCD_OUTPUT $(DBG_FLAGS)