diff --git a/Modules/arraymodule.c b/Modules/arraymodule.c
index 0ac3cab..4791890 100644
--- a/Modules/arraymodule.c
+++ b/Modules/arraymodule.c
@@ -1850,6 +1850,8 @@
 		/* Impossible, but needed to shut up GCC about the unhandled
 		 * enumeration value.
 		 */
+	default:
+		PyErr_BadArgument();
 		return NULL;
 	}