diff --git a/include/aeb_opcodes.hrl b/include/aeb_opcodes.hrl
index 0e7d0e0..fea855c 100644
--- a/include/aeb_opcodes.hrl
+++ b/include/aeb_opcodes.hrl
@@ -179,3 +179,5 @@
 -define(PRIM_CALL_MAP_SIZE,   304).
 -define(PRIM_CALL_MAP_TOLIST, 305).
 
+-define(PRIM_CALL_IN_CRYPTO_RANGE(__TTYPE__), (((__TTYPE__) > 399) andalso ((__TTYPE__) < 500))).
+-define(PRIM_CALL_CRYPTO_ECVERIFY, 400).
diff --git a/src/aeb_primops.erl b/src/aeb_primops.erl
index b7aaeaf..abf1093 100644
--- a/src/aeb_primops.erl
+++ b/src/aeb_primops.erl
@@ -14,8 +14,9 @@
 
 -include("aeb_opcodes.hrl").
 
-is_local_primop_op(Op) when ?PRIM_CALL_IN_MAP_RANGE(Op) -> true;
-is_local_primop_op(Op) when is_integer(Op) -> false.
+is_local_primop_op(Op) when ?PRIM_CALL_IN_MAP_RANGE(Op)    -> true;
+is_local_primop_op(Op) when ?PRIM_CALL_IN_CRYPTO_RANGE(Op) -> true;
+is_local_primop_op(Op) when is_integer(Op)                 -> false.
 
 op_needs_type_check(Op) ->
     (not is_local_primop_op(Op)) andalso op_has_dynamic_type(Op).