diff --git a/src/index.ts b/src/index.ts
index 43791227..0a567ddb 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -347,7 +347,10 @@ export class CucumberJsJsonReporter extends WDIOReporter {
         let data = attachment?.data
 
         // If the mime_type is 'text/plain' or 'application/json', encode the data to a base64 string (like Cucumber v10+ does)
-        if (attachment.type === 'text/plain' || attachment.type === 'application/json') {
+        if (attachment.type === 'text/plain') {
+            data = Buffer.from(String(data)).toString('base64')
+        }
+        if (attachment.type === 'application/json') {
             data = Buffer.from(JSON.stringify(data)).toString('base64')
         }
 
diff --git a/tests/__snapshots__/reporter.spec.ts.snap b/tests/__snapshots__/reporter.spec.ts.snap
index 187e644c..0d217525 100644
--- a/tests/__snapshots__/reporter.spec.ts.snap
+++ b/tests/__snapshots__/reporter.spec.ts.snap
@@ -19,7 +19,7 @@ exports[`reporter > cucumberJsAttachment > should be able to add embeddings to a
 {
   "embeddings": [
     {
-      "data": "ImRhdGEi",
+      "data": "ZGF0YQ==",
       "mime_type": "text/plain",
     },
   ],
@@ -52,7 +52,7 @@ exports[`reporter > cucumberJsAttachment > should be able to add embeddings to a
       "mime_type": "text/plain",
     },
     {
-      "data": "ImRhdGEtMiI=",
+      "data": "ZGF0YS0y",
       "mime_type": "text/plain",
     },
   ],
diff --git a/tests/__snapshots__/reporter.test.ts.snap b/tests/__snapshots__/reporter.test.ts.snap
index 144246a3..98b25dc1 100644
--- a/tests/__snapshots__/reporter.test.ts.snap
+++ b/tests/__snapshots__/reporter.test.ts.snap
@@ -19,7 +19,7 @@ exports[`reporter > cucumberJsAttachment > should be able to add embeddings to a
 {
   "embeddings": [
     {
-      "data": "ImRhdGEi",
+      "data": "ZGF0YQ==",
       "mime_type": "text/plain",
     },
   ],
@@ -52,7 +52,7 @@ exports[`reporter > cucumberJsAttachment > should be able to add embeddings to a
       "mime_type": "text/plain",
     },
     {
-      "data": "ImRhdGEtMiI=",
+      "data": "ZGF0YS0y",
       "mime_type": "text/plain",
     },
   ],