diff --git a/frontends/riscos/filetype.c b/frontends/riscos/filetype.c
index 73651cd63..d75214191 100644
--- a/frontends/riscos/filetype.c
+++ b/frontends/riscos/filetype.c
@@ -39,6 +39,7 @@ static const struct type_entry type_map[] = {
 	{0x188, "application/x-shockwave-flash"},
 	{0x695, "image/gif"},
 	{0x69c, "image/x-ms-bmp"},
+        {0xa66, "image/webp"},
 	{0xaad, "image/svg+xml"},
 	{0xaff, "image/x-drawfile"},
 	{0xb60, "image/png"},
@@ -269,6 +270,7 @@ int ro_content_native_type(struct hlcache_handle *c)
 	case FILETYPE_BMP: /* bmp */
 	case FILETYPE_ICO: /* ico */
 	case FILETYPE_PNG: /* png */
+	case FILETYPE_WEBP: /* webp */
 	case 0xff9: /* sprite */
 		return osfile_TYPE_SPRITE;
 	case FILETYPE_SVG: /* svg */
diff --git a/frontends/riscos/filetype.h b/frontends/riscos/filetype.h
index 4c45e7bd0..b9fca4d49 100644
--- a/frontends/riscos/filetype.h
+++ b/frontends/riscos/filetype.h
@@ -67,6 +67,9 @@
 #ifndef FILETYPE_SVG
 #define FILETYPE_SVG 0xaad
 #endif
+#ifndef FILETYPE_WEBP
+#define FILETYPE_WEBP 0xa66
+#endif
 
 /**
  * Determine the MIME type of a local file.
diff --git a/frontends/riscos/gui.c b/frontends/riscos/gui.c
index b0eb23256..cc12eaccb 100644
--- a/frontends/riscos/gui.c
+++ b/frontends/riscos/gui.c
@@ -827,6 +827,7 @@ static void ro_msg_dataload(wimp_message *message)
 		case osfile_TYPE_TEXT:
 		case FILETYPE_ARTWORKS:
 		case FILETYPE_SVG:
+		case FILETYPE_WEBP:
 			/* display the actual file */
 			error = netsurf_path_to_nsurl(message->data.data_xfer.file_name, &url);
 			break;
@@ -929,7 +930,8 @@ static void ro_msg_datasave(wimp_message *message)
 		case osfile_TYPE_SPRITE:
 		case osfile_TYPE_TEXT:
 		case FILETYPE_ARTWORKS:
-		case FILETYPE_SVG: {
+		case FILETYPE_SVG:
+		case FILETYPE_WEBP: {
 			os_error *error;
 
 			dataxfer->your_ref = dataxfer->my_ref;