diff --git a/base64/decode/decode.node.ts b/base64/decode/decode.node.ts
index 36112b9becb..47c3674dc45 100644
--- a/base64/decode/decode.node.ts
+++ b/base64/decode/decode.node.ts
@@ -1,5 +1,8 @@
 namespace $ {
 	export function $mol_base64_decode_node(base64Str: string): Uint8Array {
+		
+		base64Str = base64Str.replace( /-/g, '+' ).replace( /_/g, '/' )
+		
 		// without Uint8Array breaks $mol_compare_deep
 		const buffer = Buffer.from(base64Str, 'base64')
 
diff --git a/base64/decode/decode.web.ts b/base64/decode/decode.web.ts
index 30d5f9baf11..9bacc15a7c8 100644
--- a/base64/decode/decode.web.ts
+++ b/base64/decode/decode.web.ts
@@ -1,6 +1,7 @@
 namespace $ {
 
 	export function $mol_base64_decode_web(base64Str: string): Uint8Array {
+		base64Str = base64Str.replace( /-/g, '+' ).replace( /_/g, '/' )
 		return new Uint8Array($mol_dom_context.atob(base64Str).split('').map(c => c.charCodeAt(0)))
 	}