diff --git a/drivers/net/mlx4/mlx4.c b/drivers/net/mlx4/mlx4.c
index 4428edf108..975df9b747 100644
--- a/drivers/net/mlx4/mlx4.c
+++ b/drivers/net/mlx4/mlx4.c
@@ -48,6 +48,10 @@
 #include "mlx4_rxtx.h"
 #include "mlx4_utils.h"
 
+#ifdef MLX4_GLUE
+const struct mlx4_glue *mlx4_glue;
+#endif
+
 struct mlx4_dev_list mlx4_mem_event_cb_list =
 	LIST_HEAD_INITIALIZER(mlx4_mem_event_cb_list);
 
diff --git a/drivers/net/mlx4/mlx4_glue.h b/drivers/net/mlx4/mlx4_glue.h
index 668ca86700..5d9e985495 100644
--- a/drivers/net/mlx4/mlx4_glue.h
+++ b/drivers/net/mlx4/mlx4_glue.h
@@ -84,6 +84,6 @@ struct mlx4_glue {
 				   void *attr);
 };
 
-const struct mlx4_glue *mlx4_glue;
+extern const struct mlx4_glue *mlx4_glue;
 
 #endif /* MLX4_GLUE_H_ */
diff --git a/drivers/net/mlx4/mlx4_rxtx.h b/drivers/net/mlx4/mlx4_rxtx.h
index 29389f1ea7..baf0cd73a8 100644
--- a/drivers/net/mlx4/mlx4_rxtx.h
+++ b/drivers/net/mlx4/mlx4_rxtx.h
@@ -120,7 +120,7 @@ struct txq {
 
 /* mlx4_rxq.c */
 
-uint8_t mlx4_rss_hash_key_default[MLX4_RSS_HASH_KEY_SIZE];
+extern uint8_t mlx4_rss_hash_key_default[MLX4_RSS_HASH_KEY_SIZE];
 int mlx4_rss_init(struct mlx4_priv *priv);
 void mlx4_rss_deinit(struct mlx4_priv *priv);
 struct mlx4_rss *mlx4_rss_get(struct mlx4_priv *priv, uint64_t fields,