diff --git a/fwprovider/resource_options.go b/fwprovider/resource_options.go
index 8ed001b6..d49d5c63 100644
--- a/fwprovider/resource_options.go
+++ b/fwprovider/resource_options.go
@@ -255,7 +255,8 @@ func (m *clusterOptionsModel) importFromOptionsAPI(
 	m.Language = types.StringPointerValue(opts.Language)
 
 	if opts.MaxWorkers != nil {
-		m.MaxWorkers = types.Int64PointerValue(opts.MaxWorkers.PointerInt64())
+		value := int64(*opts.MaxWorkers)
+		m.MaxWorkers = types.Int64PointerValue(&value)
 	} else {
 		m.MaxWorkers = types.Int64Null()
 	}
diff --git a/proxmox/cluster/options_types.go b/proxmox/cluster/options_types.go
index 8de486bb..4647bda7 100644
--- a/proxmox/cluster/options_types.go
+++ b/proxmox/cluster/options_types.go
@@ -63,16 +63,16 @@ type OptionsResponseBody struct {
 // OptionsResponseData contains the data from a cluster options response.
 type OptionsResponseData struct {
 	optionsBaseData
-	MaxWorkers                *types.CustomInt `json:"max_workers,omitempty"`
-	ClusterResourceScheduling *crs             `json:"crs,omitempty"`
-	HASettings                *haSettings      `json:"ha,omitempty"`
-	TagStyle                  *tagStyle        `json:"tag-style,omitempty"`
-	Migration                 *migration       `json:"migration,omitempty"`
-	Webauthn                  *webauthn        `json:"webauthn,omitempty"`
-	NextID                    *nextID          `json:"next-id,omitempty"`
-	Notify                    *notify          `json:"notify,omitempty"`
-	UserTagAccess             *userTagAccess   `json:"user-tag-access,omitempty"`
-	RegisteredTags            *[]string        `json:"registered-tags,omitempty"`
+	MaxWorkers                *types.CustomInt64 `json:"max_workers,omitempty"`
+	ClusterResourceScheduling *crs               `json:"crs,omitempty"`
+	HASettings                *haSettings        `json:"ha,omitempty"`
+	TagStyle                  *tagStyle          `json:"tag-style,omitempty"`
+	Migration                 *migration         `json:"migration,omitempty"`
+	Webauthn                  *webauthn          `json:"webauthn,omitempty"`
+	NextID                    *nextID            `json:"next-id,omitempty"`
+	Notify                    *notify            `json:"notify,omitempty"`
+	UserTagAccess             *userTagAccess     `json:"user-tag-access,omitempty"`
+	RegisteredTags            *[]string          `json:"registered-tags,omitempty"`
 }
 
 // OptionsRequestData contains the body for cluster options request.
diff --git a/proxmox/nodes/vms/vms_types.go b/proxmox/nodes/vms/vms_types.go
index 8c59f3ca..11c36d79 100644
--- a/proxmox/nodes/vms/vms_types.go
+++ b/proxmox/nodes/vms/vms_types.go
@@ -432,11 +432,11 @@ type GetResponseData struct {
 	CPULimit             *types.CustomInt                `json:"cpulimit,omitempty"`
 	CPUSockets           *int                            `json:"sockets,omitempty"`
 	CPUUnits             *int                            `json:"cpuunits,omitempty"`
-	DedicatedMemory      *int64                          `json:"memory,omitempty"`
+	DedicatedMemory      *types.CustomInt64              `json:"memory,omitempty"`
 	DeletionProtection   *types.CustomBool               `json:"protection,omitempty"`
 	Description          *string                         `json:"description,omitempty"`
 	EFIDisk              *CustomEFIDisk                  `json:"efidisk0,omitempty"`
-	FloatingMemory       *int64                          `json:"balloon,omitempty"`
+	FloatingMemory       *types.CustomInt64              `json:"balloon,omitempty"`
 	FloatingMemoryShares *int                            `json:"shares,omitempty"`
 	Freeze               *types.CustomBool               `json:"freeze,omitempty"`
 	HookScript           *string                         `json:"hookscript,omitempty"`
diff --git a/proxmox/types/common_types.go b/proxmox/types/common_types.go
index 5eb3f22a..7b579667 100644
--- a/proxmox/types/common_types.go
+++ b/proxmox/types/common_types.go
@@ -9,6 +9,7 @@ package types
 import (
 	"bytes"
 	"encoding/json"
+	"fmt"
 	"strconv"
 	"strings"
 	"time"
@@ -25,6 +26,9 @@ type CustomCommaSeparatedList []string
 // CustomInt allows a JSON integer value to also be a string.
 type CustomInt int
 
+// CustomInt64 allows a JSON int64 value to also be a string.
+type CustomInt64 int64
+
 // CustomLineBreakSeparatedList allows a multiline JSON string to also be a string array.
 type CustomLineBreakSeparatedList []string
 
@@ -106,7 +110,7 @@ func (r *CustomInt) UnmarshalJSON(b []byte) error {
 
 	i, err := strconv.ParseInt(s, 10, 32)
 	if err != nil {
-		return err
+		return fmt.Errorf("cannot parse int %q: %w", s, err)
 	}
 
 	*r = CustomInt(i)
@@ -114,15 +118,22 @@ func (r *CustomInt) UnmarshalJSON(b []byte) error {
 	return nil
 }
 
-// PointerInt64 returns a pointer to an int64.
-func (r *CustomInt) PointerInt64() *int64 {
-	if r == nil {
-		return nil
+// UnmarshalJSON converts a JSON value to an integer.
+func (r *CustomInt64) UnmarshalJSON(b []byte) error {
+	s := string(b)
+
+	if strings.HasPrefix(s, "\"") && strings.HasSuffix(s, "\"") {
+		s = s[1 : len(s)-1]
 	}
 
-	i := int64(*r)
+	i, err := strconv.ParseInt(s, 10, 64)
+	if err != nil {
+		return fmt.Errorf("cannot parse int64 %q: %w", s, err)
+	}
 
-	return &i
+	*r = CustomInt64(i)
+
+	return nil
 }
 
 // MarshalJSON converts a boolean to a JSON value.