diff --git a/tests/test-nonblocking-reader.h b/tests/test-nonblocking-reader.h
index 8cba131..d8eaa32 100644
--- a/tests/test-nonblocking-reader.h
+++ b/tests/test-nonblocking-reader.h
@@ -110,7 +110,7 @@ full_read_from_nonblocking_fd (size_t fd, void *buf, size_t count)
       ASSERT (spent_time < 0.5);
       if (ret < 0)
         {
-          ASSERT (saved_errno == EAGAIN);
+          ASSERT (saved_errno == EAGAIN || saved_errno == EWOULDBLOCK);
           usleep (SMALL_DELAY);
         }
       else
diff --git a/tests/test-nonblocking-writer.h b/tests/test-nonblocking-writer.h
index 0ecf996..ff148dc 100644
--- a/tests/test-nonblocking-writer.h
+++ b/tests/test-nonblocking-writer.h
@@ -124,7 +124,7 @@ main_writer_loop (int test, size_t data_block_size, int fd,
                         (long) ret, dbgstrerror (ret < 0, saved_errno));
             if (ret < 0 && bytes_written >= data_block_size)
               {
-                ASSERT (saved_errno == EAGAIN);
+                ASSERT (saved_errno == EAGAIN || saved_errno == EWOULDBLOCK);
                 ASSERT (spent_time < 0.5);
                 break;
               }
@@ -133,7 +133,7 @@ main_writer_loop (int test, size_t data_block_size, int fd,
             ASSERT (spent_time < 0.5);
             if (ret < 0)
               {
-                ASSERT (saved_errno == EAGAIN);
+                ASSERT (saved_errno == EAGAIN || saved_errno == EWOULDBLOCK);
                 usleep (SMALL_DELAY);
               }
             else
@@ -165,7 +165,7 @@ main_writer_loop (int test, size_t data_block_size, int fd,
             ASSERT (spent_time < 0.5);
             if (ret < 0)
               {
-                ASSERT (saved_errno == EAGAIN);
+                ASSERT (saved_errno == EAGAIN || saved_errno == EWOULDBLOCK);
                 usleep (SMALL_DELAY);
               }
             else