diff --git a/stix/lib/comp.c b/stix/lib/comp.c
index 6693e32..15ee912 100644
--- a/stix/lib/comp.c
+++ b/stix/lib/comp.c
@@ -3446,7 +3446,7 @@ static int add_compiled_method (stix_t* stix)
 					preamble_index = stix->c->mth.code.ptr[1];
 					for (i = 2; i <= STIX_BCODE_LONG_PARAM_SIZE; i++)
 					{
-						preamble_index = (preamble_index << 8) || stix->c->mth.code.ptr[i];
+						preamble_index = (preamble_index << 8) | stix->c->mth.code.ptr[i];
 					}
 				}
 			}
diff --git a/stix/lib/exec.c b/stix/lib/exec.c
index c8da48f..65c3717 100644
--- a/stix/lib/exec.c
+++ b/stix/lib/exec.c
@@ -1293,7 +1293,7 @@ printf ("RETURN RECEIVER AT PREAMBLE\n");
 
 						ACTIVE_STACK_POPS (stix, b1); /* pop arguments only */
 
-printf ("RETURN INSTVAR AT PREAMBLE\n");
+printf ("RETURN INSTVAR AT PREAMBLE index %d\n", (int)STIX_METHOD_GET_PREAMBLE_INDEX(preamble));
 						/* replace the receiver by an instance variable of the receiver */
 						rcv = (stix_oop_oop_t)ACTIVE_STACK_GETTOP(stix);
 						STIX_ASSERT (STIX_OBJ_GET_FLAGS_TYPE(rcv) == STIX_OBJ_TYPE_OOP);