diff --git a/gowsdl.go b/gowsdl.go
index 32aee6b..dbd139b 100644
--- a/gowsdl.go
+++ b/gowsdl.go
@@ -494,29 +494,30 @@ func goString(s string) string {
 }
 
 var xsd2GoTypes = map[string]string{
-	"string":        "string",
-	"token":         "string",
-	"float":         "float32",
-	"double":        "float64",
-	"decimal":       "float64",
-	"integer":       "int32",
-	"int":           "int32",
-	"short":         "int16",
-	"byte":          "int8",
-	"long":          "int64",
-	"boolean":       "bool",
-	"datetime":      "soap.XSDDateTime",
-	"date":          "soap.XSDDate",
-	"time":          "soap.XSDTime",
-	"base64binary":  "[]byte",
-	"hexbinary":     "[]byte",
-	"unsignedint":   "uint32",
-	"unsignedshort": "uint16",
-	"unsignedbyte":  "byte",
-	"unsignedlong":  "uint64",
-	"anytype":       "AnyType",
-	"ncname":        "NCName",
-	"anyuri":        "AnyURI",
+	"string":             "string",
+	"token":              "string",
+	"float":              "float32",
+	"double":             "float64",
+	"decimal":            "float64",
+	"integer":            "int32",
+	"int":                "int32",
+	"short":              "int16",
+	"byte":               "int8",
+	"long":               "int64",
+	"boolean":            "bool",
+	"datetime":           "soap.XSDDateTime",
+	"date":               "soap.XSDDate",
+	"time":               "soap.XSDTime",
+	"base64binary":       "[]byte",
+	"hexbinary":          "[]byte",
+	"unsignedint":        "uint32",
+	"nonnegativeinteger": "uint32",
+	"unsignedshort":      "uint16",
+	"unsignedbyte":       "byte",
+	"unsignedlong":       "uint64",
+	"anytype":            "AnyType",
+	"ncname":             "NCName",
+	"anyuri":             "AnyURI",
 }
 
 func removeNS(xsdType string) string {