diff --git a/sys/dev/ichiic/ig4_acpi.c b/sys/dev/ichiic/ig4_acpi.c
--- a/sys/dev/ichiic/ig4_acpi.c
+++ b/sys/dev/ichiic/ig4_acpi.c
@@ -108,7 +108,7 @@
 		ig4iic_acpi_detach(dev);
 		return (ENXIO);
 	}
-	sc->platform_attached = 1;
+	sc->platform_attached = true;
 
 	error = ig4iic_attach(sc);
 	if (error)
@@ -127,7 +127,7 @@
 		error = ig4iic_detach(sc);
 		if (error)
 			return (error);
-		sc->platform_attached = 0;
+		sc->platform_attached = false;
 	}
 
 	if (sc->intr_res) {
diff --git a/sys/dev/ichiic/ig4_iic.c b/sys/dev/ichiic/ig4_iic.c
--- a/sys/dev/ichiic/ig4_iic.c
+++ b/sys/dev/ichiic/ig4_iic.c
@@ -337,9 +337,9 @@
 {
 	uint32_t tar;
 	uint32_t ctl;
-	int use_10bit;
+	bool use_10bit;
 
-	use_10bit = 0;
+	use_10bit = false;
 	if (sc->slave_valid && sc->last_slave == slave &&
 	    sc->use_10bit == use_10bit) {
 		return;
@@ -364,7 +364,7 @@
 	reg_write(sc, IG4_REG_CTL, ctl);
 	reg_write(sc, IG4_REG_TAR_ADD, tar);
 	set_controller(sc, IG4_I2C_ENABLE);
-	sc->slave_valid = 1;
+	sc->slave_valid = true;
 	sc->last_slave = slave;
 }
 
@@ -1009,7 +1009,7 @@
 		  (sc->cfg.bus_speed & IG4_CTL_SPEED_MASK));
 
 	/* Force setting of the target address on the next transfer */
-	sc->slave_valid = 0;
+	sc->slave_valid = false;
 
 	return (0);
 }
diff --git a/sys/dev/ichiic/ig4_pci.c b/sys/dev/ichiic/ig4_pci.c
--- a/sys/dev/ichiic/ig4_pci.c
+++ b/sys/dev/ichiic/ig4_pci.c
@@ -316,7 +316,7 @@
 		ig4iic_pci_detach(dev);
 		return (ENXIO);
 	}
-	sc->platform_attached = 1;
+	sc->platform_attached = true;
 
 	error = ig4iic_attach(sc);
 	if (error)
@@ -335,7 +335,7 @@
 		error = ig4iic_detach(sc);
 		if (error)
 			return (error);
-		sc->platform_attached = 0;
+		sc->platform_attached = false;
 	}
 
 	if (sc->intr_res) {
diff --git a/sys/dev/ichiic/ig4_var.h b/sys/dev/ichiic/ig4_var.h
--- a/sys/dev/ichiic/ig4_var.h
+++ b/sys/dev/ichiic/ig4_var.h
@@ -91,10 +91,10 @@
 	struct ig4_cfg	cfg;
 	uint32_t	intr_mask;
 	uint8_t		last_slave;
-	int		platform_attached : 1;
-	int		use_10bit : 1;
-	int		slave_valid : 1;
-	int		poll: 1;
+	bool		platform_attached : 1;
+	bool		use_10bit : 1;
+	bool		slave_valid : 1;
+	bool		poll: 1;
 
 	/*
 	 * Locking semantics: