diff --git a/src/libguac/client.c b/src/libguac/client.c
index fa75249d..949bc26f 100644
--- a/src/libguac/client.c
+++ b/src/libguac/client.c
@@ -451,7 +451,7 @@ void guac_client_stream_webp(guac_client* client, guac_socket* socket,
 int guac_client_supports_webp(guac_client* client) {
 
 #ifdef ENABLE_WEBP
-    const char** mimetype = client->info.image_mimetypes;
+    char** mimetype = client->info.image_mimetypes;
 
     /* Search for WebP mimetype in list of supported image mimetypes */
     while (*mimetype != NULL) {
diff --git a/src/libguac/guacamole/client.h b/src/libguac/guacamole/client.h
index d385976b..be7842ef 100644
--- a/src/libguac/guacamole/client.h
+++ b/src/libguac/guacamole/client.h
@@ -65,20 +65,20 @@ struct guac_client_info {
      * NULL-terminated array of client-supported audio mimetypes. If the client
      * does not support audio at all, this will be NULL.
      */
-    const char** audio_mimetypes;
+    char** audio_mimetypes;
 
     /**
      * NULL-terminated array of client-supported video mimetypes. If the client
      * does not support video at all, this will be NULL.
      */
-    const char** video_mimetypes;
+    char** video_mimetypes;
 
     /**
      * NULL-terminated array of client-supported image mimetypes. Though all
      * supported image mimetypes will be listed here, it can be safely assumed
      * that all clients will support at least "image/png" and "image/jpeg".
      */ 
-    const char** image_mimetypes;
+    char** image_mimetypes;
 
     /**
      * The DPI of the physical remote display if configured for the optimal