diff --git a/go.mod b/go.mod
index f717b8c..2f9fd4f 100644
--- a/go.mod
+++ b/go.mod
@@ -2,4 +2,4 @@ module github.com/wrfly/gua
 
 go 1.12
 
-require github.com/wrfly/ecp v0.1.1-0.20190725160759-97269b9e95f0
+require github.com/wrfly/ecp v0.1.3
diff --git a/go.sum b/go.sum
index f7938d5..dbd0d47 100644
--- a/go.sum
+++ b/go.sum
@@ -1,8 +1,2 @@
-github.com/wrfly/ecp v0.0.0-20190321163603-bbc550e18246 h1:DZkmqllKFxC++nqcKKYZgO2U1pZJzwQw+8n7fEhOJfk=
-github.com/wrfly/ecp v0.0.0-20190321163603-bbc550e18246/go.mod h1:lTrjsp9nYtempzKMd5XzGjU1MraaXFrhPTs8WhC3DFU=
-github.com/wrfly/ecp v0.0.0-20190321181722-563aa2b61fa2 h1:sZ96zRMTzmnhft2+iACUlzWzF4CtlA1uTkLN7xLznOQ=
-github.com/wrfly/ecp v0.0.0-20190321181722-563aa2b61fa2/go.mod h1:lTrjsp9nYtempzKMd5XzGjU1MraaXFrhPTs8WhC3DFU=
-github.com/wrfly/ecp v0.1.0 h1:btwZO5LGlM5SNykaUXGkJIjwckpjPU2MjFatehSCmY8=
-github.com/wrfly/ecp v0.1.0/go.mod h1:cmmFTD+MLlrDa3/EO3gjeKLKUhHiYP3cgaaJamIS1NU=
-github.com/wrfly/ecp v0.1.1-0.20190725160759-97269b9e95f0 h1:Zy3Chk4CvwAqJ6YgQym6hJQEk4JE7iPbHRfxkru6Zn0=
-github.com/wrfly/ecp v0.1.1-0.20190725160759-97269b9e95f0/go.mod h1:cmmFTD+MLlrDa3/EO3gjeKLKUhHiYP3cgaaJamIS1NU=
+github.com/wrfly/ecp v0.1.3 h1:xu7fjaU05sFHe+3giB4R+mwSUNCiB2Kk8QvQy8OawcI=
+github.com/wrfly/ecp v0.1.3/go.mod h1:cmmFTD+MLlrDa3/EO3gjeKLKUhHiYP3cgaaJamIS1NU=
diff --git a/gua.go b/gua.go
index 96256da..41d6c1e 100644
--- a/gua.go
+++ b/gua.go
@@ -55,11 +55,6 @@ func (g *gua) getFlagValue(field reflect.Value, key string) (string, bool) {
 	return "", false
 }
 
-func init() {
-	// reset lookup key function
-	ecp.LookupKey = func(original, _, _ string) string { return original }
-}
-
 type key struct {
 	name  string
 	value *string
@@ -102,8 +97,10 @@ func ParseWithFlagSet(c interface{}, f *flag.FlagSet) error {
 
 	frog := gua{make(map[string]key, 20), f}
 
+	ecp := ecp.New()
 	ecp.GetKey = frog.getKey
 	ecp.LookupValue = frog.getFlagValue
+	ecp.LookupKey = func(original, _, _ string) string { return original }
 
 	if err := ecp.Parse(c, ""); err != nil {
 		return err