diff --git a/crypto/smartcont/stdlib.fc b/crypto/smartcont/stdlib.fc
index 8fb27a7e..8112d29e 100644
--- a/crypto/smartcont/stdlib.fc
+++ b/crypto/smartcont/stdlib.fc
@@ -634,6 +634,7 @@ int get_seed() impure asm "RANDSEED";
 
 ;;; Checks whether the data parts of two slices coinside
 int equal_slice_bits (slice a, slice b) asm "SDEQ";
+int slice_data_equal?(slice a, slice b) asm "SDEQ";
 
 ;;; Concatenates two builders
 builder store_builder(builder to, builder from) asm "STBR";