diff --git a/stdlib/builtins.pyi b/stdlib/builtins.pyi
index 1a88e708a..23958919d 100644
--- a/stdlib/builtins.pyi
+++ b/stdlib/builtins.pyi
@@ -364,10 +364,24 @@ class float:
     def __bool__(self) -> bool: ...
 
 class complex:
-    @overload
-    def __new__(cls: type[Self], real: float = ..., imag: float = ...) -> Self: ...
-    @overload
-    def __new__(cls: type[Self], real: str | SupportsComplex | SupportsIndex | complex) -> Self: ...
+    if sys.version_info >= (3, 8):
+        # Python doesn't currently accept SupportsComplex for the second argument
+        @overload
+        def __new__(
+            cls: type[Self],
+            real: complex | SupportsComplex | SupportsFloat | SupportsIndex = ...,
+            imag: complex | SupportsFloat | SupportsIndex = ...,
+        ) -> Self: ...
+        @overload
+        def __new__(cls: type[Self], real: str | SupportsComplex | SupportsFloat | SupportsIndex | complex) -> Self: ...
+    else:
+        @overload
+        def __new__(
+            cls: type[Self], real: complex | SupportsComplex | SupportsFloat = ..., imag: complex | SupportsFloat = ...
+        ) -> Self: ...
+        @overload
+        def __new__(cls: type[Self], real: str | SupportsComplex | SupportsFloat | complex) -> Self: ...
+
     @property
     def real(self) -> float: ...
     @property