diff --git a/sexpdata.py b/sexpdata.py
index df389d9..9aa24fb 100644
--- a/sexpdata.py
+++ b/sexpdata.py
@@ -730,6 +730,8 @@ def atom(self, token):
             return int(token)
         except ValueError:
             try:
+                if 'e' in token.lower() or 'inf' in token.lower():
+                    raise ValueError('Invalid s-exp float')
                 return float(token)
             except ValueError:
                 return Symbol(token)
diff --git a/test_sexpdata.py b/test_sexpdata.py
index 53bbca9..69c60d5 100644
--- a/test_sexpdata.py
+++ b/test_sexpdata.py
@@ -207,6 +207,12 @@ def test_tosexp_value_errors():
         tosexp(Parens())
 
 
+def test_parse_float():
+    assert parse("-1.012") == [-1.012]
+    assert parse("2E22") == [Symbol("2E22")]
+    assert parse("inf") == [Symbol("inf")]
+
+
 def test_too_many_brackets():
     with pytest.raises(ExpectNothing):
         parse("(a b))")