diff --git a/lib/curl_threads.h b/lib/curl_threads.h
index 3be46c7b15..5a1609a2c9 100644
--- a/lib/curl_threads.h
+++ b/lib/curl_threads.h
@@ -27,9 +27,6 @@
 
 #ifdef USE_MUTEX
 #ifdef HAVE_THREADS_POSIX
-#ifdef HAVE_PTHREAD_H
-#include <pthread.h>
-#endif
 #  define CURL_THREAD_RETURN_T   unsigned int
 #  define CURL_STDCALL
 #  define curl_mutex_t           pthread_mutex_t
diff --git a/lib/easy_lock.h b/lib/easy_lock.h
index aa2fea705c..c6732b1a42 100644
--- a/lib/easy_lock.h
+++ b/lib/easy_lock.h
@@ -86,8 +86,6 @@ static CURL_INLINE void curl_simple_lock_unlock(curl_simple_lock *lock)
 
 #elif defined(HAVE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
 
-#include <pthread.h>
-
 #define curl_simple_lock           pthread_mutex_t
 #define CURL_SIMPLE_LOCK_INIT      PTHREAD_MUTEX_INITIALIZER
 #define curl_simple_lock_lock(m)   pthread_mutex_lock(m)
diff --git a/lib/thrdpool.c b/lib/thrdpool.c
index 2cd87094bb..5e83d0a6c8 100644
--- a/lib/thrdpool.c
+++ b/lib/thrdpool.c
@@ -25,10 +25,6 @@
 
 #ifdef USE_THREADS
 
-#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
-#include <pthread.h>
-#endif
-
 #include "llist.h"
 #include "curl_threads.h"
 #include "curlx/timeval.h"
diff --git a/lib/thrdqueue.c b/lib/thrdqueue.c
index c2bd628a4b..c9079f011e 100644
--- a/lib/thrdqueue.c
+++ b/lib/thrdqueue.c
@@ -25,10 +25,6 @@
 
 #ifdef USE_THREADS
 
-#if defined(USE_THREADS_POSIX) && defined(HAVE_PTHREAD_H)
-#include <pthread.h>
-#endif
-
 #include "llist.h"
 #include "curl_threads.h"
 #include "thrdpool.h"
diff --git a/tests/libtest/lib1565.c b/tests/libtest/lib1565.c
index 765650af3b..18d50a4dda 100644
--- a/tests/libtest/lib1565.c
+++ b/tests/libtest/lib1565.c
@@ -24,7 +24,6 @@
 #include "first.h"
 
 #ifdef HAVE_PTHREAD_H
-#include <pthread.h>
 
 #define CONN_NUM                3
 #define TIME_BETWEEN_START_SECS 2
diff --git a/tests/libtest/lib3026.c b/tests/libtest/lib3026.c
index 0eb2a14c3b..d025802d19 100644
--- a/tests/libtest/lib3026.c
+++ b/tests/libtest/lib3026.c
@@ -85,7 +85,6 @@ cleanup:
 }
 
 #elif defined(HAVE_PTHREAD_H)
-#include <pthread.h>
 
 static void *t3026_run_thread(void *ptr)
 {