diff --git a/types/dropzone/dropzone-tests.ts b/types/dropzone/dropzone-tests.ts
index 53cedba333..4abc3a6223 100644
--- a/types/dropzone/dropzone-tests.ts
+++ b/types/dropzone/dropzone-tests.ts
@@ -56,6 +56,7 @@ const dropzoneWithOptions = new Dropzone(".test", {
 	dictRemoveFile: "",
 	dictRemoveFileConfirmation: "",
 	dictMaxFilesExceeded: "",
+	dictFileSizeUnits: { tb: "", gb: "", mb: "", kb: "", b: "" },
 
 	accept: (file: Dropzone.DropzoneFile, done: (error?: string | Error) => void) => {
 		if (file.accepted) {
diff --git a/types/dropzone/index.d.ts b/types/dropzone/index.d.ts
index f809f84227..0295afbed2 100644
--- a/types/dropzone/index.d.ts
+++ b/types/dropzone/index.d.ts
@@ -26,6 +26,14 @@ declare namespace Dropzone {
 		accepted: boolean;
 		xhr?: XMLHttpRequest;
 	}
+	
+	export interface DropzoneDictFileSizeUnits { 
+		tb?: string;
+		gb?: string;
+		mb?: string;
+		kb?: string;
+		b?: string;
+	}
 
 	export interface DropzoneOptions {
 		url?: string;
@@ -72,6 +80,7 @@ declare namespace Dropzone {
 		dictRemoveFile?: string;
 		dictRemoveFileConfirmation?: string;
 		dictMaxFilesExceeded?: string;
+		dictFileSizeUnits?: DropzoneDictFileSizeUnits;
 
 		accept?(file: DropzoneFile, done: (error?: string | Error) => void): void;
 		init?(): void;