diff --git a/core/cond.c b/core/cond.c
index 361fb1fc84..8ff45f4d74 100644
--- a/core/cond.c
+++ b/core/cond.c
@@ -24,7 +24,7 @@
 #include "mutex.h"
 #include "thread.h"
 
-#define ENABLE_DEBUG    (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 void cond_init(cond_t *cond)
diff --git a/core/lifo.c b/core/lifo.c
index 38e34dea23..b725f42102 100644
--- a/core/lifo.c
+++ b/core/lifo.c
@@ -19,7 +19,7 @@
 #include "lifo.h"
 #include "log.h"
 
-#define ENABLE_DEBUG (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 int lifo_empty(int *array)
diff --git a/core/mbox.c b/core/mbox.c
index e970bf829b..6a186cfc00 100644
--- a/core/mbox.c
+++ b/core/mbox.c
@@ -25,7 +25,7 @@
 #include "sched.h"
 #include "thread.h"
 
-#define ENABLE_DEBUG (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 static void _wake_waiter(thread_t *thread, unsigned irqstate)
diff --git a/core/msg.c b/core/msg.c
index be61d70cc3..2747c5b4bc 100644
--- a/core/msg.c
+++ b/core/msg.c
@@ -34,7 +34,7 @@
 #include "irq.h"
 #include "cib.h"
 
-#define ENABLE_DEBUG    (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 static int _msg_receive(msg_t *m, int block);
diff --git a/core/mutex.c b/core/mutex.c
index d40611d6d9..db544d25e2 100644
--- a/core/mutex.c
+++ b/core/mutex.c
@@ -29,7 +29,7 @@
 #include "irq.h"
 #include "list.h"
 
-#define ENABLE_DEBUG    (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 int _mutex_lock(mutex_t *mutex, volatile uint8_t *blocking)
diff --git a/core/priority_queue.c b/core/priority_queue.c
index 52495b2bff..3a2027f900 100644
--- a/core/priority_queue.c
+++ b/core/priority_queue.c
@@ -22,7 +22,7 @@
 
 #include "priority_queue.h"
 
-#define ENABLE_DEBUG (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 void priority_queue_remove(priority_queue_t *root_, priority_queue_node_t *node)
diff --git a/core/rmutex.c b/core/rmutex.c
index 49901a1e7c..f967049258 100644
--- a/core/rmutex.c
+++ b/core/rmutex.c
@@ -28,7 +28,7 @@
 #include "thread.h"
 #include "assert.h"
 
-#define ENABLE_DEBUG    (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 static int _lock(rmutex_t *rmutex, int trylock)
diff --git a/core/sched.c b/core/sched.c
index 21ef5ba577..8ef0f06ba7 100644
--- a/core/sched.c
+++ b/core/sched.c
@@ -32,7 +32,7 @@
 #include "mpu.h"
 #endif
 
-#define ENABLE_DEBUG (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 #if ENABLE_DEBUG
diff --git a/core/thread_flags.c b/core/thread_flags.c
index 3c2e532690..ff3b91eea6 100644
--- a/core/thread_flags.c
+++ b/core/thread_flags.c
@@ -23,7 +23,7 @@
 #include "irq.h"
 #include "thread.h"
 
-#define ENABLE_DEBUG (0)
+#define ENABLE_DEBUG 0
 #include "debug.h"
 
 static inline int __attribute__((always_inline)) _thread_flags_wake(thread_t *thread)