diff --git a/server/core/dcb.c b/server/core/dcb.c
index 0828e2d6d..e6ef6baf8 100644
--- a/server/core/dcb.c
+++ b/server/core/dcb.c
@@ -92,6 +92,15 @@
 #include <sys/un.h>
 #include <maxscale/alloc.h>
 
+#if defined(FAKE_CODE)
+unsigned char dcb_fake_write_errno[10240];
+__int32_t     dcb_fake_write_ev[10240];
+bool          fail_next_backend_fd;
+bool          fail_next_client_fd;
+int           fail_next_accept;
+int           fail_accept_errno;
+#endif /* FAKE_CODE */
+
 /* The list of all DCBs */
 static LIST_CONFIG DCBlist =
 {LIST_TYPE_RECYCLABLE, sizeof(DCB), SPINLOCK_INIT};
diff --git a/server/include/dcb.h b/server/include/dcb.h
index 5e41baacf..2fbabd191 100644
--- a/server/include/dcb.h
+++ b/server/include/dcb.h
@@ -293,12 +293,12 @@ typedef enum
 } DCB_USAGE;
 
 #if defined(FAKE_CODE)
-unsigned char dcb_fake_write_errno[10240];
-__int32_t     dcb_fake_write_ev[10240];
-bool          fail_next_backend_fd;
-bool          fail_next_client_fd;
-int           fail_next_accept;
-int           fail_accept_errno;
+extern unsigned char dcb_fake_write_errno[10240];
+extern __int32_t     dcb_fake_write_ev[10240];
+extern bool          fail_next_backend_fd;
+extern bool          fail_next_client_fd;
+extern int           fail_next_accept;
+extern int           fail_accept_errno;
 #endif /* FAKE_CODE */
 
 /* A few useful macros */