diff --git a/sys/posix/pthread/include/pthread.h b/sys/posix/pthread/include/pthread.h
index 183e9ecb69..df5d5d6092 100644
--- a/sys/posix/pthread/include/pthread.h
+++ b/sys/posix/pthread/include/pthread.h
@@ -22,6 +22,10 @@
 
 #include <time.h>
 
+#ifndef __WITH_AVRLIBC__
+#define HAVE_MALLOC_H 1
+#endif
+
 #include "mutex.h"
 #include "sched.h"
 
diff --git a/sys/posix/pthread/include/pthread_cond.h b/sys/posix/pthread/include/pthread_cond.h
index ebbd54f731..5d34d50554 100644
--- a/sys/posix/pthread/include/pthread_cond.h
+++ b/sys/posix/pthread/include/pthread_cond.h
@@ -25,7 +25,7 @@
 #   include "msp430_types.h"
 #endif
 
-#if defined(__MACH__)
+#if defined(__MACH__) || defined(__WITH_AVRLIBC__)
 typedef int clockid_t;
 #endif
 
diff --git a/sys/posix/pthread/pthread.c b/sys/posix/pthread/pthread.c
index dd7cbdf5a7..64d72ec261 100644
--- a/sys/posix/pthread/pthread.c
+++ b/sys/posix/pthread/pthread.c
@@ -19,7 +19,6 @@
  * @}
  */
 
-#include <malloc.h>
 #include <stdbool.h>
 #include <stddef.h>
 #include <string.h>
@@ -34,6 +33,10 @@
 
 #include "pthread.h"
 
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+
 #define ENABLE_DEBUG (0)
 
 #if ENABLE_DEBUG
diff --git a/sys/posix/pthread/pthread_tls.c b/sys/posix/pthread/pthread_tls.c
index 028d132074..dbd272f3c8 100644
--- a/sys/posix/pthread/pthread_tls.c
+++ b/sys/posix/pthread/pthread_tls.c
@@ -16,10 +16,12 @@
  * @}
  */
 
-#include <malloc.h>
-
 #include "pthread.h"
 
+#ifdef HAVE_MALLOC_H
+#include <malloc.h>
+#endif
+
 #define ENABLE_DEBUG (0)
 #include "debug.h"