diff --git a/inc/blt.h b/inc/blt.h
index 76f3bf5..8f35696 100644
--- a/inc/blt.h
+++ b/inc/blt.h
@@ -99,6 +99,18 @@ void blt_rgb565_to_rgba8888(
     int src_y,
     int src_p);
 
+void blt_rgb555_to_rgba8888(
+    unsigned int* dst,
+    int dst_x,
+    int dst_y,
+    int dst_w,
+    int dst_h,
+    int dst_p,
+    unsigned short* src,
+    int src_x,
+    int src_y,
+    int src_p);
+
 void blt_bgra8888_to_rgba8888(
     unsigned int* dst,
     int dst_x,