diff --git a/src/sfnt/ttcolr.c b/src/sfnt/ttcolr.c
index 312b70a5f..1c3fd70d0 100644
--- a/src/sfnt/ttcolr.c
+++ b/src/sfnt/ttcolr.c
@@ -661,6 +661,7 @@
       FT_UInt32  first_layer_index;
 
 
+      ENSURE_READ_BYTES( 5 );
       num_layers = FT_NEXT_BYTE( p );
       if ( num_layers > colr->num_layers_v1 )
         return 0;