diff --git a/Python/modsupport.c b/Python/modsupport.c
index ef36d108f5b..08685898da2 100644
--- a/Python/modsupport.c
+++ b/Python/modsupport.c
@@ -286,6 +286,12 @@ do_mkvalue(char **p_format, va_list *p_va)
 			return PyFloat_FromDouble(
 				(double)va_arg(*p_va, va_double));
 
+#ifndef WITHOUT_COMPLEX
+		case 'D':
+			return PyComplex_FromCComplex(
+				*((Py_complex *)va_arg(*p_va, Py_complex *)));
+#endif /* WITHOUT_COMPLEX */
+
 		case 'c':
 		{
 			char p[1];