diff --git a/sys/dev/e1000/e1000_82575.h b/sys/dev/e1000/e1000_82575.h
index 7e127ed79dbc..a96b25f4169d 100644
--- a/sys/dev/e1000/e1000_82575.h
+++ b/sys/dev/e1000/e1000_82575.h
@@ -385,7 +385,7 @@ struct e1000_adv_tx_context_desc {
 #define E1000_ETQF_FILTER_ENABLE	(1 << 26)
 #define E1000_ETQF_IMM_INT		(1 << 29)
 #define E1000_ETQF_1588			(1 << 30)
-#define E1000_ETQF_QUEUE_ENABLE		(1 << 31)
+#define E1000_ETQF_QUEUE_ENABLE		(1U << 31)
 /*
  * ETQF filter list: one static filter per filter consumer. This is
  *                   to avoid filter collisions later. Add new filters
@@ -412,7 +412,7 @@ struct e1000_adv_tx_context_desc {
 #define E1000_DTXSWC_LLE_MASK		0x00FF0000 /* Per VF Local LB enables */
 #define E1000_DTXSWC_VLAN_SPOOF_SHIFT	8
 #define E1000_DTXSWC_LLE_SHIFT		16
-#define E1000_DTXSWC_VMDQ_LOOPBACK_EN	(1 << 31)  /* global VF LB enable */
+#define E1000_DTXSWC_VMDQ_LOOPBACK_EN	(1U << 31)  /* global VF LB enable */
 
 /* Easy defines for setting default pool, would normally be left a zero */
 #define E1000_VT_CTL_DEFAULT_POOL_SHIFT	7
diff --git a/sys/dev/e1000/e1000_ich8lan.c b/sys/dev/e1000/e1000_ich8lan.c
index 43241ff7b9ef..64eb89bc1257 100644
--- a/sys/dev/e1000/e1000_ich8lan.c
+++ b/sys/dev/e1000/e1000_ich8lan.c
@@ -5202,7 +5202,7 @@ static void e1000_initialize_hw_bits_ich8lan(struct e1000_hw *hw)
 	/* Device Status */
 	if (hw->mac.type == e1000_ich8lan) {
 		reg = E1000_READ_REG(hw, E1000_STATUS);
-		reg &= ~(1 << 31);
+		reg &= ~(1U << 31);
 		E1000_WRITE_REG(hw, E1000_STATUS, reg);
 	}
 
diff --git a/sys/dev/e1000/e1000_regs.h b/sys/dev/e1000/e1000_regs.h
index d99498174158..246968e9f936 100644
--- a/sys/dev/e1000/e1000_regs.h
+++ b/sys/dev/e1000/e1000_regs.h
@@ -215,7 +215,7 @@
 /* QAV Tx mode control register bitfields masks */
 #define E1000_TQAVCC_IDLE_SLOPE		0xFFFF /* Idle slope */
 #define E1000_TQAVCC_KEEP_CREDITS	(1 << 30) /* Keep credits opt enable */
-#define E1000_TQAVCC_QUEUE_MODE		(1 << 31) /* SP vs. SR Tx mode */
+#define E1000_TQAVCC_QUEUE_MODE		(1U << 31) /* SP vs. SR Tx mode */
 
 /* Good transmitted packets counter registers */
 #define E1000_PQGPTC(_n)		(0x010014 + (0x100 * (_n)))