diff --git a/internal/data/movies.go b/internal/data/movies.go
index f1b042c..040175c 100644
--- a/internal/data/movies.go
+++ b/internal/data/movies.go
@@ -7,7 +7,7 @@ type Movie struct {
 	CreatedAt time.Time `json:"-"`
 	Title     string    `json:"title"`
 	Year      int32     `json:"year,omitempty"`
-	Runtime   int32     `json:"runtime,omitempty,string"`
+	Runtime   Runtime   `json:"runtime,omitempty"`
 	Genres    []string  `json:"genres,omitempty"`
 	Version   int32     `json:"version"`
 }
diff --git a/internal/data/runtime.go b/internal/data/runtime.go
new file mode 100644
index 0000000..85295bb
--- /dev/null
+++ b/internal/data/runtime.go
@@ -0,0 +1,15 @@
+package data
+
+import (
+	"fmt"
+	"strconv"
+)
+
+type Runtime int32
+
+func (r Runtime) MarshalJSON() ([]byte, error) {
+	jsonValue := fmt.Sprintf("%d mins", r)
+
+	quotedJSONValue := strconv.Quote(jsonValue)
+	return []byte(quotedJSONValue), nil
+}