diff --git a/bundles/org.openhab.core.io.rest.voice/src/main/java/org/openhab/core/io/rest/voice/internal/VoiceResource.java b/bundles/org.openhab.core.io.rest.voice/src/main/java/org/openhab/core/io/rest/voice/internal/VoiceResource.java
index de11bac8b12..305802f1155 100644
--- a/bundles/org.openhab.core.io.rest.voice/src/main/java/org/openhab/core/io/rest/voice/internal/VoiceResource.java
+++ b/bundles/org.openhab.core.io.rest.voice/src/main/java/org/openhab/core/io/rest/voice/internal/VoiceResource.java
@@ -139,8 +139,9 @@ public Response getInterpreter(
     @POST
     @Path("/interpreters/{ids: [a-zA-Z_0-9,]+}")
     @Consumes(MediaType.TEXT_PLAIN)
+    @Produces(MediaType.TEXT_PLAIN)
     @Operation(operationId = "interpretText", summary = "Sends a text to a given human language interpreter(s).", responses = {
-            @ApiResponse(responseCode = "200", description = "OK"),
+            @ApiResponse(responseCode = "200", description = "OK", content = @Content(schema = @Schema(implementation = String.class))),
             @ApiResponse(responseCode = "404", description = "No human language interpreter was found."),
             @ApiResponse(responseCode = "400", description = "interpretation exception occurs") })
     public Response interpret(
@@ -175,8 +176,9 @@ public Response interpret(
     @POST
     @Path("/interpreters")
     @Consumes(MediaType.TEXT_PLAIN)
+    @Produces(MediaType.TEXT_PLAIN)
     @Operation(operationId = "interpretTextByDefaultInterpreter", summary = "Sends a text to the default human language interpreter.", responses = {
-            @ApiResponse(responseCode = "200", description = "OK"),
+            @ApiResponse(responseCode = "200", description = "OK", content = @Content(schema = @Schema(implementation = String.class))),
             @ApiResponse(responseCode = "404", description = "No human language interpreter was found."),
             @ApiResponse(responseCode = "400", description = "interpretation exception occurs") })
     public Response interpret(
@@ -189,8 +191,8 @@ public Response interpret(
         }
 
         try {
-            hli.interpret(locale, text);
-            return Response.ok(null, MediaType.TEXT_PLAIN).build();
+            String answer = hli.interpret(locale, text);
+            return Response.ok(answer, MediaType.TEXT_PLAIN).build();
         } catch (InterpretationException e) {
             return JSONResponse.createErrorResponse(Status.BAD_REQUEST, e.getMessage());
         }