diff --git a/man3/pthread_attr_init.3 b/man3/pthread_attr_init.3
index 4f28d4a76..ed7faaff0 100644
--- a/man3/pthread_attr_init.3
+++ b/man3/pthread_attr_init.3
@@ -266,7 +266,7 @@ main(int argc, char *argv[])
        and set attrp pointing to thread attributes object */
 
     if (argc > 1) {
-        int stack_size;
+        size_t stack_size;
         void *sp;
 
         attrp = &attr;
diff --git a/man3/pthread_create.3 b/man3/pthread_create.3
index c1c4c2ff5..af75ff6a5 100644
--- a/man3/pthread_create.3
+++ b/man3/pthread_create.3
@@ -325,7 +325,7 @@ main(int argc, char *argv[])
 {
     int s, opt, num_threads;
     pthread_attr_t attr;
-    int stack_size;
+    size_t stack_size;
     void *res;
 
     /* The "\-s" option specifies a stack size for our threads */
diff --git a/man3/pthread_getattr_np.3 b/man3/pthread_getattr_np.3
index 01716b99d..be957607e 100644
--- a/man3/pthread_getattr_np.3
+++ b/man3/pthread_getattr_np.3
@@ -268,7 +268,7 @@ get_thread_attributes_from_cl(int argc, char *argv[],
                               pthread_attr_t *attrp)
 {
     int s, opt, allocate_stack;
-    long stack_size, guard_size;
+    size_t stack_size, guard_size;
     void *stack_addr;
     pthread_attr_t *ret_attrp = NULL;   /* Set to attrp if we initialize
                                            a thread attributes object */