diff --git a/examples/wallet/wallet.vy b/examples/wallet/wallet.vy
index 5fd5229136..31996feafc 100644
--- a/examples/wallet/wallet.vy
+++ b/examples/wallet/wallet.vy
@@ -58,7 +58,7 @@ def approve(_seq: int128, to: address, _value: uint256, data: Bytes[4096], sigda
     # Increase the number of approved transactions by 1
     self.seq += 1
     # Use raw_call to send the transaction
-    return raw_call(to, data, max_outsize=4096, gas=3000000, value=_value)
+    return raw_call(to, data, max_outsize=4096, gas=3_000_000, value=_value)
 
 
 @external
diff --git a/tests/grammar/test_grammar.py b/tests/grammar/test_grammar.py
index aa0286cfa5..b828d28e43 100644
--- a/tests/grammar/test_grammar.py
+++ b/tests/grammar/test_grammar.py
@@ -22,6 +22,11 @@ def test_basic_grammar():
     def one_two_three() -> uint256:
         return 123123123
     """
+    code_nums = """
+    x: constant(uint256) = 100_000
+    y: constant(uint256) = 0o100_000
+    z: constant(decimal) = 1.100_000_007
+    """
 
     assert parse_vyper_source(code, dedent=True)
     assert parse_to_ast(textwrap.dedent(code))
@@ -29,6 +34,9 @@ def one_two_three() -> uint256:
     assert parse_vyper_source(code_func, dedent=True)
     assert parse_to_ast(textwrap.dedent(code_func))
 
+    assert parse_vyper_source(code_nums, dedent=True)
+    assert parse_to_ast(textwrap.dedent(code_nums))
+
 
 def test_basic_grammar_empty():
     code = """