diff --git a/src/libjsparser/opcodes-dumper.c b/src/libjsparser/opcodes-dumper.c
index 89ef90aa3..1211565c9 100644
--- a/src/libjsparser/opcodes-dumper.c
+++ b/src/libjsparser/opcodes-dumper.c
@@ -617,7 +617,7 @@ create_operand_from_tmp_and_lit (idx_t tmp, literal_index_t lit_id)
 {
   if (tmp != LITERAL_TO_REWRITE)
   {
-    JERRY_ASSERT (lit_id != NOT_A_LITERAL);
+    JERRY_ASSERT (lit_id == NOT_A_LITERAL);
     return (operand)
     {
       .type = OPERAND_TMP,
@@ -626,7 +626,7 @@ create_operand_from_tmp_and_lit (idx_t tmp, literal_index_t lit_id)
   }
   else
   {
-    JERRY_ASSERT (lit_id == NOT_A_LITERAL);
+    JERRY_ASSERT (lit_id != NOT_A_LITERAL);
     return (operand)
     {
       .type = OPERAND_LITERAL,
diff --git a/tests/jerry/array.js b/tests/jerry/array.js
index 880e7b857..14c2339d6 100644
--- a/tests/jerry/array.js
+++ b/tests/jerry/array.js
@@ -77,3 +77,7 @@ assert (c[0] === 0);
 assert (c[1] === undefined);
 assert (c[2] === undefined);
 assert (c[3] === '3');
+
+b[0] = 1;
+c[0] += b[0];
+assert (c[0] == 1);