diff --git a/cpu/lpc2387/include/periph_cpu.h b/cpu/lpc2387/include/periph_cpu.h
index bf1db82f7f..95f4cceac3 100644
--- a/cpu/lpc2387/include/periph_cpu.h
+++ b/cpu/lpc2387/include/periph_cpu.h
@@ -126,7 +126,7 @@ typedef struct {
 /**
  * @brief   Number of available timer channels
  */
-#define TIMER_CHANNELS      (4U)
+#define TIMER_CHANNEL_NUMOF (4U)
 
 /**
  * @brief   Declare needed generic SPI functions
diff --git a/cpu/lpc2387/periph/timer.c b/cpu/lpc2387/periph/timer.c
index bf1c7caeb8..6a409287bc 100644
--- a/cpu/lpc2387/periph/timer.c
+++ b/cpu/lpc2387/periph/timer.c
@@ -42,17 +42,17 @@ static uint32_t _oneshot;
 
 static inline void set_oneshot(tim_t tim, int chan)
 {
-    _oneshot |= (1 << chan) << (TIMER_CHANNELS * tim);
+    _oneshot |= (1 << chan) << (TIMER_CHANNEL_NUMOF * tim);
 }
 
 static inline void clear_oneshot(tim_t tim, int chan)
 {
-    _oneshot &= ~((1 << chan) << (TIMER_CHANNELS * tim));
+    _oneshot &= ~((1 << chan) << (TIMER_CHANNEL_NUMOF * tim));
 }
 
 static inline bool is_oneshot(tim_t tim, int chan)
 {
-    return _oneshot & ((1 << chan) << (TIMER_CHANNELS * tim));
+    return _oneshot & ((1 << chan) << (TIMER_CHANNEL_NUMOF * tim));
 }
 
 /**
@@ -156,7 +156,7 @@ int timer_init(tim_t tim, unsigned long freq, timer_cb_t cb, void *arg)
 
 int timer_set_absolute(tim_t tim, int channel, unsigned int value)
 {
-    if (((unsigned) tim >= TIMER_NUMOF) || ((unsigned) channel >= TIMER_CHANNELS)) {
+    if (((unsigned) tim >= TIMER_NUMOF) || ((unsigned) channel >= TIMER_CHANNEL_NUMOF)) {
         return -1;
     }
 
@@ -172,7 +172,7 @@ int timer_set_absolute(tim_t tim, int channel, unsigned int value)
 
 int timer_set_periodic(tim_t tim, int channel, unsigned int value, uint8_t flags)
 {
-    if (((unsigned) tim >= TIMER_NUMOF) || ((unsigned) channel >= TIMER_CHANNELS)) {
+    if (((unsigned) tim >= TIMER_NUMOF) || ((unsigned) channel >= TIMER_CHANNEL_NUMOF)) {
         return -1;
     }
 
@@ -202,7 +202,7 @@ int timer_set_periodic(tim_t tim, int channel, unsigned int value, uint8_t flags
 
 int timer_clear(tim_t tim, int channel)
 {
-    if (((unsigned) tim >= TIMER_NUMOF) || ((unsigned) channel >= TIMER_CHANNELS)) {
+    if (((unsigned) tim >= TIMER_NUMOF) || ((unsigned) channel >= TIMER_CHANNEL_NUMOF)) {
         return -1;
     }
     get_dev(tim)->MCR &= ~(1 << (channel * 3));
@@ -242,7 +242,7 @@ static inline void chan_handler(lpc23xx_timer_t *dev, unsigned tim_num, unsigned
 
 static inline void isr_handler(lpc23xx_timer_t *dev, int tim_num)
 {
-    for (unsigned i = 0; i < TIMER_CHANNELS; ++i) {
+    for (unsigned i = 0; i < TIMER_CHANNEL_NUMOF; ++i) {
         chan_handler(dev, tim_num, i);
     }