diff --git a/cache.go b/cache.go
index 86de914..aabe17f 100644
--- a/cache.go
+++ b/cache.go
@@ -153,7 +153,13 @@ func (v *Validate) extractStructCache(current reflect.Value, sName string) *cStr
 			ctag = new(cTag)
 		}
 
-		cs.fields[i] = &cField{idx: i, name: fld.Name, altName: customName, cTags: ctag, namesEqual: fld.Name == customName}
+		cs.fields[i] = &cField{
+			idx:        i,
+			name:       fld.Name,
+			altName:    customName,
+			cTags:      ctag,
+			namesEqual: fld.Name == customName,
+		}
 	}
 
 	v.structCache.Set(typ, cs)
diff --git a/errors.go b/errors.go
index b279b92..0e4489c 100644
--- a/errors.go
+++ b/errors.go
@@ -132,14 +132,12 @@ type fieldError struct {
 	actualTag      string
 	ns             string
 	structNs       string
-	fieldLen       int
-	structfieldLen int
-	// field       string
-	// structField string
-	value interface{}
-	param string
-	kind  reflect.Kind
-	typ   reflect.Type
+	fieldLen       uint8
+	structfieldLen uint8
+	value          interface{}
+	param          string
+	kind           reflect.Kind
+	typ            reflect.Type
 }
 
 // Tag returns the validation tag that failed.
@@ -169,13 +167,13 @@ func (fe *fieldError) StructNamespace() string {
 // fields actual name.
 func (fe *fieldError) Field() string {
 	// return fe.field
-	return fe.ns[len(fe.ns)-fe.fieldLen:]
+	return fe.ns[len(fe.ns)-int(fe.fieldLen):]
 }
 
 // returns the fields actual name from the struct, when able to determine.
 func (fe *fieldError) StructField() string {
 	// return fe.structField
-	return fe.structNs[len(fe.structNs)-fe.structfieldLen:]
+	return fe.structNs[len(fe.structNs)-int(fe.structfieldLen):]
 }
 
 // Value returns the actual fields value in case needed for creating the error
diff --git a/struct_level.go b/struct_level.go
index aaaf327..d12d7e9 100644
--- a/struct_level.go
+++ b/struct_level.go
@@ -121,8 +121,8 @@ func (v *validate) ReportError(field interface{}, fieldName, structFieldName, ta
 				actualTag:      tag,
 				ns:             v.str1,
 				structNs:       v.str2,
-				fieldLen:       len(fieldName),
-				structfieldLen: len(structFieldName),
+				fieldLen:       uint8(len(fieldName)),
+				structfieldLen: uint8(len(structFieldName)),
 				param:          param,
 				kind:           kind,
 			},
@@ -136,8 +136,8 @@ func (v *validate) ReportError(field interface{}, fieldName, structFieldName, ta
 			actualTag:      tag,
 			ns:             v.str1,
 			structNs:       v.str2,
-			fieldLen:       len(fieldName),
-			structfieldLen: len(structFieldName),
+			fieldLen:       uint8(len(fieldName)),
+			structfieldLen: uint8(len(structFieldName)),
 			value:          fv.Interface(),
 			param:          param,
 			kind:           kind,
diff --git a/validator.go b/validator.go
index c42e6db..2119152 100644
--- a/validator.go
+++ b/validator.go
@@ -117,8 +117,8 @@ func (v *validate) traverseField(parent reflect.Value, current reflect.Value, ns
 						actualTag:      ct.tag,
 						ns:             v.str1,
 						structNs:       v.str2,
-						fieldLen:       len(cf.altName),
-						structfieldLen: len(cf.name),
+						fieldLen:       uint8(len(cf.altName)),
+						structfieldLen: uint8(len(cf.name)),
 						param:          ct.param,
 						kind:           kind,
 					},
@@ -133,8 +133,8 @@ func (v *validate) traverseField(parent reflect.Value, current reflect.Value, ns
 					actualTag:      ct.tag,
 					ns:             v.str1,
 					structNs:       v.str2,
-					fieldLen:       len(cf.altName),
-					structfieldLen: len(cf.name),
+					fieldLen:       uint8(len(cf.altName)),
+					structfieldLen: uint8(len(cf.name)),
 					value:          current.Interface(),
 					param:          ct.param,
 					kind:           kind,
@@ -327,8 +327,8 @@ OUTER:
 								actualTag:      ct.actualAliasTag,
 								ns:             v.str1,
 								structNs:       v.str2,
-								fieldLen:       len(cf.altName),
-								structfieldLen: len(cf.name),
+								fieldLen:       uint8(len(cf.altName)),
+								structfieldLen: uint8(len(cf.name)),
 								value:          current.Interface(),
 								param:          ct.param,
 								kind:           kind,
@@ -346,8 +346,8 @@ OUTER:
 								actualTag:      tVal,
 								ns:             v.str1,
 								structNs:       v.str2,
-								fieldLen:       len(cf.altName),
-								structfieldLen: len(cf.name),
+								fieldLen:       uint8(len(cf.altName)),
+								structfieldLen: uint8(len(cf.name)),
 								value:          current.Interface(),
 								param:          ct.param,
 								kind:           kind,
@@ -385,8 +385,8 @@ OUTER:
 						actualTag:      ct.tag,
 						ns:             v.str1,
 						structNs:       v.str2,
-						fieldLen:       len(cf.altName),
-						structfieldLen: len(cf.name),
+						fieldLen:       uint8(len(cf.altName)),
+						structfieldLen: uint8(len(cf.name)),
 						value:          current.Interface(),
 						param:          ct.param,
 						kind:           kind,