diff --git a/Modules/_struct.c b/Modules/_struct.c
index e8fe67d..d09013f 100644
--- a/Modules/_struct.c
+++ b/Modules/_struct.c
@@ -155,8 +155,11 @@
 		assert(PyLong_Check(v));
 		r = v;
 	}
-	else
+	else {
+		r = NULL;   /* silence compiler warning about
+			       possibly uninitialized variable */
 		assert(0);  /* shouldn't ever get here */
+	}
 
 	return r;
 }