diff --git a/mmgen/opts.py b/mmgen/opts.py
index 88c33cce..2b3d3237 100755
--- a/mmgen/opts.py
+++ b/mmgen/opts.py
@@ -115,6 +115,30 @@ def opt_postproc_debug():
 		Msg('        {:<20}: {}'.format(e, getattr(g,e)))
 	Msg('\n=== end opts.py debug ===\n')
 
+def set_for_type(val,refval,desc,invert_bool=False,src=None):
+
+	if type(refval) == bool:
+		v = str(val).lower()
+		ret = (
+			True  if v in ('true','yes','1','on') else
+			False if v in ('false','no','none','0','off','') else
+			None
+		)
+		if ret is not None:
+			return not ret if invert_bool else ret
+	else:
+		try:
+			return type(refval)(not val if invert_bool else val)
+		except:
+			pass
+
+	from .util import die
+	die(1,'{!r}: invalid value for {!r}{} (must be of type {!r})'.format(
+		val,
+		desc,
+		' in {!r}'.format(src) if src else '',
+		type(refval).__name__) )
+
 def override_globals_from_cfg_file(ucfg):
 	from .protocol import CoinProtocol,init_proto
 	for d in ucfg.get_lines():
diff --git a/mmgen/util.py b/mmgen/util.py
index 50d9cfab..d71c1609 100755
--- a/mmgen/util.py
+++ b/mmgen/util.py
@@ -191,29 +191,6 @@ def get_keccak():
 
 	return keccak_256
 
-def set_for_type(val,refval,desc,invert_bool=False,src=None):
-
-	if type(refval) == bool:
-		v = str(val).lower()
-		ret = (
-			True  if v in ('true','yes','1','on') else
-			False if v in ('false','no','none','0','off','') else
-			None
-		)
-		if ret is not None:
-			return not ret if invert_bool else ret
-	else:
-		try:
-			return type(refval)(not val if invert_bool else val)
-		except:
-			pass
-
-	die(1,'{!r}: invalid value for {!r}{} (must be of type {!r})'.format(
-		val,
-		desc,
-		' in {!r}'.format(src) if src else '',
-		type(refval).__name__) )
-
 # From 'man dd':
 # c=1, w=2, b=512, kB=1000, K=1024, MB=1000*1000, M=1024*1024,
 # GB=1000*1000*1000, G=1024*1024*1024, and so on for T, P, E, Z, Y.