diff --git a/src/libcoreint/opcodes.c b/src/libcoreint/opcodes.c
index ba87a2be2..f2910521f 100644
--- a/src/libcoreint/opcodes.c
+++ b/src/libcoreint/opcodes.c
@@ -13,6 +13,7 @@
  * limitations under the License.
  */
 
+#include "ecma-alloc.h"
 #include "ecma-exceptions.h"
 #include "ecma-helpers.h"
 #include "ecma-operations.h"
@@ -271,7 +272,25 @@ opfunc_assignment (OPCODE opdata, /**< operation data */
         break;
       }
     case OPCODE_ARG_TYPE_NUMBER:
+      {
+        ecma_Number_t *num_p = ecma_AllocNumber();
+        *num_p = get_number_by_idx( src_val_descr);
+
+        right_value.m_ValueType = ECMA_TYPE_NUMBER;        
+        ecma_SetPointer( right_value.m_Value, num_p);
+
+        break;
+      }
     case OPCODE_ARG_TYPE_SMALLINT:
+      {
+        ecma_Number_t *num_p = ecma_AllocNumber();
+        *num_p = src_val_descr;
+
+        right_value.m_ValueType = ECMA_TYPE_NUMBER;        
+        ecma_SetPointer( right_value.m_Value, num_p);
+
+        break;
+      }
       JERRY_UNIMPLEMENTED();
   }
 
diff --git a/tests/unit/test_assignment_opcode.c b/tests/unit/test_assignment_opcode.c
index 38ce4fabb..550c26e2a 100644
--- a/tests/unit/test_assignment_opcode.c
+++ b/tests/unit/test_assignment_opcode.c
@@ -30,6 +30,8 @@ main( int __unused argc,
     getop_var_decl( 1),
     getop_assignment( 0, OPCODE_ARG_TYPE_STRING, 1),
     getop_assignment( 1, OPCODE_ARG_TYPE_VARIABLE, 0),
+    getop_assignment( 0, OPCODE_ARG_TYPE_SMALLINT, 253),
+    getop_assignment( 1, OPCODE_ARG_TYPE_NUMBER, 2),
     getop_exitval( 0)
   };