diff --git a/sys/arm/broadcom/bcm2835/bcm2835_gpio.c b/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
index 5fb0ea0634d2..9c5f5cddf750 100644
--- a/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
+++ b/sys/arm/broadcom/bcm2835/bcm2835_gpio.c
@@ -55,8 +55,6 @@ __FBSDID("$FreeBSD$");
 
 #include "gpio_if.h"
 
-#undef	DEBUG
-
 #ifdef DEBUG
 #define dprintf(fmt, args...) do { printf("%s(): ", __func__);   \
     printf(fmt,##args); } while (0)
diff --git a/sys/arm/lpc/if_lpe.c b/sys/arm/lpc/if_lpe.c
index e83b0a5a9caf..f8a8659ec119 100644
--- a/sys/arm/lpc/if_lpe.c
+++ b/sys/arm/lpc/if_lpe.c
@@ -65,9 +65,6 @@ __FBSDID("$FreeBSD$");
 
 #include "miibus_if.h"
 
-#define	DEBUG
-#undef	DEBUG
-
 #ifdef DEBUG
 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
     printf(fmt,##args); } while (0)
diff --git a/sys/arm/lpc/lpc_mmc.c b/sys/arm/lpc/lpc_mmc.c
index 2e7473ccd829..3aa6d470d2d1 100644
--- a/sys/arm/lpc/lpc_mmc.c
+++ b/sys/arm/lpc/lpc_mmc.c
@@ -64,9 +64,6 @@ __FBSDID("$FreeBSD$");
 #include <arm/lpc/lpcreg.h>
 #include <arm/lpc/lpcvar.h>
 
-#define	DEBUG
-#undef	DEBUG
-
 #ifdef DEBUG
 #define debugf(fmt, args...) do { printf("%s(): ", __func__);   \
     printf(fmt,##args); } while (0)
diff --git a/sys/boot/uboot/lib/disk.c b/sys/boot/uboot/lib/disk.c
index e861bc08881c..62b31328f011 100644
--- a/sys/boot/uboot/lib/disk.c
+++ b/sys/boot/uboot/lib/disk.c
@@ -45,9 +45,6 @@ __FBSDID("$FreeBSD$");
 #include "glue.h"
 #include "libuboot.h"
 
-#define DEBUG
-#undef DEBUG
-
 #define stor_printf(fmt, args...) do {			\
     printf("%s%d: ", dev->d_dev->dv_name, dev->d_unit);	\
     printf(fmt, ##args);				\
diff --git a/sys/boot/uboot/lib/glue.c b/sys/boot/uboot/lib/glue.c
index df12a7db01e1..f389f1128ba6 100644
--- a/sys/boot/uboot/lib/glue.c
+++ b/sys/boot/uboot/lib/glue.c
@@ -34,9 +34,6 @@ __FBSDID("$FreeBSD$");
 #include "api_public.h"
 #include "glue.h"
 
-#define DEBUG
-#undef DEBUG
-
 #ifdef DEBUG
 #define	debugf(fmt, args...) do { printf("%s(): ", __func__); printf(fmt,##args); } while (0)
 #else
diff --git a/sys/dev/cesa/cesa.c b/sys/dev/cesa/cesa.c
index d5739e961dda..bc9a56840dbe 100644
--- a/sys/dev/cesa/cesa.c
+++ b/sys/dev/cesa/cesa.c
@@ -71,8 +71,6 @@ __FBSDID("$FreeBSD$");
 #include <arm/mv/mvvar.h>
 #include "cesa.h"
 
-#undef DEBUG
-
 static int	cesa_probe(device_t);
 static int	cesa_attach(device_t);
 static int	cesa_detach(device_t);
diff --git a/sys/dev/fdt/fdt_slicer.c b/sys/dev/fdt/fdt_slicer.c
index d32d1595287c..9f65f73f747d 100644
--- a/sys/dev/fdt/fdt_slicer.c
+++ b/sys/dev/fdt/fdt_slicer.c
@@ -35,9 +35,6 @@ __FBSDID("$FreeBSD$");
 
 #include <dev/fdt/fdt_common.h>
 
-#define DEBUG
-#undef DEBUG
-
 #ifdef DEBUG
 #define debugf(fmt, args...) do { printf("%s(): ", __func__);	\
     printf(fmt,##args); } while (0)
diff --git a/sys/powerpc/mpc85xx/fsl_sdhc.c b/sys/powerpc/mpc85xx/fsl_sdhc.c
index ecd6572524bb..12b18b124856 100644
--- a/sys/powerpc/mpc85xx/fsl_sdhc.c
+++ b/sys/powerpc/mpc85xx/fsl_sdhc.c
@@ -64,8 +64,6 @@ __FBSDID("$FreeBSD$");
 
 #include "fsl_sdhc.h"
 
-#define DEBUG
-#undef DEBUG
 #ifdef DEBUG
 #define	DPRINTF(fmt, arg...)	printf("DEBUG %s(): " fmt, __FUNCTION__, ##arg)
 #else