diff --git a/pkg/lib/configreader/errors.go b/pkg/lib/configreader/errors.go
index 952d2c73d5..eb466bf8dd 100644
--- a/pkg/lib/configreader/errors.go
+++ b/pkg/lib/configreader/errors.go
@@ -139,7 +139,7 @@ func ErrorMustHavePrefix(provided string, prefix string) error {
 }
 
 func ErrorInvalidInterface(provided interface{}, allowed interface{}, allowedVals ...interface{}) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]interface{}{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidInterface,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -147,7 +147,7 @@ func ErrorInvalidInterface(provided interface{}, allowed interface{}, allowedVal
 }
 
 func ErrorInvalidFloat64(provided float64, allowed float64, allowedVals ...float64) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]float64{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidFloat64,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -155,7 +155,7 @@ func ErrorInvalidFloat64(provided float64, allowed float64, allowedVals ...float
 }
 
 func ErrorInvalidFloat32(provided float32, allowed float32, allowedVals ...float32) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]float32{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidFloat32,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -163,7 +163,7 @@ func ErrorInvalidFloat32(provided float32, allowed float32, allowedVals ...float
 }
 
 func ErrorInvalidInt64(provided int64, allowed int64, allowedVals ...int64) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]int64{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidInt64,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -171,7 +171,7 @@ func ErrorInvalidInt64(provided int64, allowed int64, allowedVals ...int64) erro
 }
 
 func ErrorInvalidInt32(provided int32, allowed int32, allowedVals ...int32) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]int32{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidInt32,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -179,7 +179,7 @@ func ErrorInvalidInt32(provided int32, allowed int32, allowedVals ...int32) erro
 }
 
 func ErrorInvalidInt(provided int, allowed int, allowedVals ...int) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]int{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidInt,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -187,7 +187,7 @@ func ErrorInvalidInt(provided int, allowed int, allowedVals ...int) error {
 }
 
 func ErrorInvalidStr(provided string, allowed string, allowedVals ...string) error {
-	allAllowedVals := append(allowedVals, allowed)
+	allAllowedVals := append([]string{allowed}, allowedVals...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidStr,
 		Message: fmt.Sprintf("invalid value (got %s, must be %s)", s.UserStr(provided), s.UserStrsOr(allAllowedVals)),
@@ -237,7 +237,7 @@ func ErrorNonStringKeyFound(key interface{}) error {
 }
 
 func ErrorInvalidPrimitiveType(provided interface{}, allowedType PrimitiveType, allowedTypes ...PrimitiveType) error {
-	allAllowedTypes := append(allowedTypes, allowedType)
+	allAllowedTypes := append([]PrimitiveType{allowedType}, allowedTypes...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrInvalidPrimitiveType,
 		Message: fmt.Sprintf("%s: invalid type (expected %s)", s.UserStr(provided), s.StrsOr(PrimitiveTypes(allAllowedTypes).StringList())),
diff --git a/pkg/operator/endpoints/errors.go b/pkg/operator/endpoints/errors.go
index 28f9e425dd..fd0791da3f 100644
--- a/pkg/operator/endpoints/errors.go
+++ b/pkg/operator/endpoints/errors.go
@@ -100,7 +100,7 @@ func ErrorPathParamRequired(param string) error {
 }
 
 func ErrorAnyQueryParamRequired(param string, params ...string) error {
-	allParams := append(params, param)
+	allParams := append([]string{param}, params...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrAnyQueryParamRequired,
 		Message: fmt.Sprintf("query params required: %s", s.UserStrsOr(allParams)),
@@ -108,7 +108,7 @@ func ErrorAnyQueryParamRequired(param string, params ...string) error {
 }
 
 func ErrorAnyPathParamRequired(param string, params ...string) error {
-	allParams := append(params, param)
+	allParams := append([]string{param}, params...)
 	return errors.WithStack(&errors.Error{
 		Kind:    ErrAnyPathParamRequired,
 		Message: fmt.Sprintf("path params required: %s", s.UserStrsOr(allParams)),
diff --git a/pkg/types/spec/errors.go b/pkg/types/spec/errors.go
index 68d9667ba7..a96c5c6e9e 100644
--- a/pkg/types/spec/errors.go
+++ b/pkg/types/spec/errors.go
@@ -102,7 +102,7 @@ func ErrorDuplicateEndpoint(apiName string) error {
 }
 
 func ErrorSpecifyAllOrNone(val string, vals ...string) error {
-	allVals := append(vals, val)
+	allVals := append([]string{val}, vals...)
 	message := fmt.Sprintf("please specify all or none of %s", s.UserStrsAnd(allVals))
 	if len(allVals) == 2 {
 		message = fmt.Sprintf("please specify both %s and %s or neither of them", s.UserStr(allVals[0]), s.UserStr(allVals[1]))
@@ -115,7 +115,7 @@ func ErrorSpecifyAllOrNone(val string, vals ...string) error {
 }
 
 func ErrorOneOfPrerequisitesNotDefined(argName string, prerequisite string, prerequisites ...string) error {
-	allPrerequisites := append(prerequisites, prerequisite)
+	allPrerequisites := append([]string{prerequisite}, prerequisites...)
 	message := fmt.Sprintf("%s specified without specifying %s", s.UserStr(argName), s.UserStrsOr(allPrerequisites))
 
 	return errors.WithStack(&errors.Error{