diff --git a/d2plugin/exec.go b/d2plugin/exec.go
index acb8a9618..efbfcd970 100644
--- a/d2plugin/exec.go
+++ b/d2plugin/exec.go
@@ -82,6 +82,8 @@ func (p *execPlugin) HydrateOpts(opts []byte) error {
 				allString[k] = vt
 			case int64:
 				allString[k] = strconv.Itoa(int(vt))
+			case float64:
+				allString[k] = strconv.Itoa(int(vt))
 			}
 		}
 
diff --git a/d2plugin/plugin.go b/d2plugin/plugin.go
index a8c894333..25eee8d08 100644
--- a/d2plugin/plugin.go
+++ b/d2plugin/plugin.go
@@ -7,6 +7,7 @@ package d2plugin
 
 import (
 	"context"
+	"encoding/json"
 	"os/exec"
 
 	"oss.terrastruct.com/util-go/xexec"
@@ -166,3 +167,28 @@ func ListPluginFlags(ctx context.Context) ([]PluginSpecificFlag, error) {
 
 	return out, nil
 }
+
+func HydratePluginOpts(ctx context.Context, ms *xmain.State, plugin Plugin) error {
+	opts := make(map[string]interface{})
+	flags, err := plugin.Flags(ctx)
+	if err != nil {
+		return err
+	}
+	for _, f := range flags {
+		switch f.Type {
+		case "string":
+			val, _ := ms.Opts.Flags.GetString(f.Name)
+			opts[f.Tag] = val
+		case "int64":
+			val, _ := ms.Opts.Flags.GetInt64(f.Name)
+			opts[f.Tag] = val
+		}
+	}
+
+	b, err := json.Marshal(opts)
+	if err != nil {
+		return err
+	}
+
+	return plugin.HydrateOpts(b)
+}
diff --git a/d2plugin/serve.go b/d2plugin/serve.go
index 2e8da78f0..acc697a96 100644
--- a/d2plugin/serve.go
+++ b/d2plugin/serve.go
@@ -41,6 +41,11 @@ func Serve(p Plugin) xmain.RunFunc {
 			return xmain.UsageErrorf("expected first argument to be subcmd name")
 		}
 
+		err = HydratePluginOpts(ctx, ms, p)
+		if err != nil {
+			return err
+		}
+
 		subcmd := ms.Opts.Flags.Arg(0)
 		switch subcmd {
 		case "info":
diff --git a/main.go b/main.go
index d9c5655b4..78041b71e 100644
--- a/main.go
+++ b/main.go
@@ -2,7 +2,6 @@ package main
 
 import (
 	"context"
-	"encoding/json"
 	"errors"
 	"fmt"
 	"io"
@@ -150,7 +149,7 @@ func run(ctx context.Context, ms *xmain.State) (err error) {
 		return err
 	}
 
-	err = parseLayoutOpts(ctx, ms, plugin)
+	err = d2plugin.HydratePluginOpts(ctx, ms, plugin)
 	if err != nil {
 		return err
 	}
@@ -314,29 +313,3 @@ func populateLayoutOpts(ctx context.Context, ms *xmain.State) error {
 
 	return nil
 }
-
-func parseLayoutOpts(ctx context.Context, ms *xmain.State, plugin d2plugin.Plugin) error {
-	opts := make(map[string]interface{})
-	flags, err := plugin.Flags(ctx)
-	if err != nil {
-		return err
-	}
-	for _, f := range flags {
-		switch f.Type {
-		case "string":
-			val, _ := ms.Opts.Flags.GetString(f.Name)
-			opts[f.Tag] = val
-		case "int64":
-			val, _ := ms.Opts.Flags.GetInt64(f.Name)
-			opts[f.Tag] = val
-		}
-	}
-
-	b, err := json.Marshal(opts)
-	if err != nil {
-		return err
-	}
-
-	err = plugin.HydrateOpts(b)
-	return err
-}