diff --git a/src/libsysprof-capture/sysprof-capture-writer.c b/src/libsysprof-capture/sysprof-capture-writer.c
index 6c9362ec..956340e8 100644
--- a/src/libsysprof-capture/sysprof-capture-writer.c
+++ b/src/libsysprof-capture/sysprof-capture-writer.c
@@ -499,7 +499,7 @@ sysprof_capture_writer_new_from_fd (int   fd,
 
   header->magic = SYSPROF_CAPTURE_MAGIC;
   header->version = 1;
-#ifdef G_LITTLE_ENDIAN
+#if G_BYTE_ORDER == G_LITTLE_ENDIAN
   header->little_endian = TRUE;
 #else
   header->little_endian = FALSE;
diff --git a/src/tests/test-capture.c b/src/tests/test-capture.c
index 4605fa0f..5f8eb3d0 100644
--- a/src/tests/test-capture.c
+++ b/src/tests/test-capture.c
@@ -28,6 +28,7 @@
 #include <unistd.h>
 
 #include "sysprof-platform.h"
+#include "sysprof-capture-util-private.h"
 
 static void
 copy_into (GHashTable *src,
@@ -54,7 +55,7 @@ test_reader_basic (void)
 
   writer = sysprof_capture_writer_new ("capture-file", 0);
   g_assert (writer != NULL);
-  g_assert_cmpint (sysprof_capture_writer_get_buffer_size (writer), ==, 4096*64);
+  g_assert_cmpint (sysprof_capture_writer_get_buffer_size (writer), ==, _sysprof_getpagesize()*64);
 
   sysprof_capture_writer_flush (writer);