diff --git a/src/key.cpp b/src/key.cpp
index a253f8666ab..a058ef05e54 100644
--- a/src/key.cpp
+++ b/src/key.cpp
@@ -396,7 +396,7 @@ const unsigned char vchMaxModHalfOrder[32] = {
     0xDF,0xE9,0x2F,0x46,0x68,0x1B,0x20,0xA0
 };
 
-const unsigned char vchZero[0] = {};
+const unsigned char vchZero[1] = {0};
 
 } // anon namespace