diff --git a/svutRun.py b/svutRun.py
index 77ce553..8eb6bb5 100755
--- a/svutRun.py
+++ b/svutRun.py
@@ -68,18 +68,18 @@ def get_defines(defines):
     """
     Return a string with the list of defines ready to drop in icarus
     """
-    icarusdefs = ""
+    simdefs = ""
 
     if not defines:
-        return icarusdefs
+        return simdefs
 
     defs = defines.split(';')
 
     for _def in defs:
         if _def:
-            icarusdefs += "-D " + _def + " "
+            simdefs += "-D" + _def + " "
 
-    return icarusdefs
+    return simdefs
 
 
 def create_iverilog(args, test):
@@ -150,6 +150,9 @@ def create_verilator(args, test):
     cmd += """+1800-2005ext+v -Wno-STMTDLY -Wno-UNUSED -Wno-UNDRIVEN -Wno-PINCONNECTEMPTY """
     cmd += """-Wpedantic -Wno-VARHIDDEN -Wno-lint """
 
+    if args.define:
+        cmd += get_defines(args.define)
+
     if args.dotfile:
 
         dotfiles = ""