diff --git a/tts_service/src/endpoints/legacy_speak.rs b/tts_service/src/endpoints/legacy_speak.rs
index c9d6b0f47c..b54515426f 100644
--- a/tts_service/src/endpoints/legacy_speak.rs
+++ b/tts_service/src/endpoints/legacy_speak.rs
@@ -154,10 +154,11 @@ pub async fn legacy_get_speak(request: HttpRequest,
           // Content-Type: audio/wav
           // Content-Disposition:
           // Content-Length: len()
+          let content_range_value = format!("bytes 0-{}/{}", wav_data.len(), wav_data.len());
           Ok(HttpResponse::build(StatusCode::OK)
               .content_type("audio/wav")
               .set_header(header::CONTENT_DISPOSITION, "attachment; filename = \"generated.wav\"")
-              .set_header(header::CONTENT_RANGE, "bytes */*")
+              .set_header(header::CONTENT_RANGE, content_range_value)
               .body(wav_data))
         },
       }
@@ -209,10 +210,11 @@ pub async fn legacy_get_speak(request: HttpRequest,
       // Content-Type: audio/wav
       // Content-Disposition:
       // Content-Length: len()
+      let content_range_value = format!("bytes 0-{}/{}", wav_data.len(), wav_data.len());
       Ok(HttpResponse::build(StatusCode::OK)
           .content_type("audio/wav")
           .set_header(header::CONTENT_DISPOSITION, "attachment; filename = \"generated.wav\"")
-          .set_header(header::CONTENT_RANGE, "bytes */*")
+          .set_header(header::CONTENT_RANGE, content_range_value)
           .body(wav_data))
     },
     ModelPipeline::RawTextTacotronMelgan => unimplemented!(),
diff --git a/tts_service/src/endpoints/speak.rs b/tts_service/src/endpoints/speak.rs
index f417e27634..67f094be06 100644
--- a/tts_service/src/endpoints/speak.rs
+++ b/tts_service/src/endpoints/speak.rs
@@ -107,10 +107,11 @@ pub async fn post_speak(request: HttpRequest,
         Some(wav_data) => {
           // To make iOS Safari work, you need a Content-Range and Content-Length header:
           // https://stackoverflow.com/a/17835399
+          let content_range_value = format!("bytes 0-{}/{}", wav_data.len(), wav_data.len());
           Ok(HttpResponse::build(StatusCode::OK)
               .content_type("audio/wav")
               .set_header(header::CONTENT_DISPOSITION, "attachment; filename = \"generated.wav\"")
-              .set_header(header::CONTENT_RANGE, "bytes */*")
+              .set_header(header::CONTENT_RANGE, content_range_value)
               .body(wav_data))
         },
       }
@@ -140,10 +141,11 @@ pub async fn post_speak(request: HttpRequest,
 
       // To make iOS Safari work, you need a Content-Range and Content-Length header:
       // https://stackoverflow.com/a/17835399
+      let content_range_value = format!("bytes 0-{}/{}", wav_data.len(), wav_data.len());
       Ok(HttpResponse::build(StatusCode::OK)
           .content_type("audio/wav")
           .set_header(header::CONTENT_DISPOSITION, "attachment; filename = \"generated.wav\"")
-          .set_header(header::CONTENT_RANGE, "bytes */*")
+          .set_header(header::CONTENT_RANGE, content_range_value)
           .body(wav_data))
     },
     ModelPipeline::RawTextTacotronMelgan => unimplemented!(),