diff --git a/tests/file/filetest.cpp b/tests/file/filetest.cpp
index 9692bd3c60..d418362875 100644
--- a/tests/file/filetest.cpp
+++ b/tests/file/filetest.cpp
@@ -156,14 +156,16 @@ TEST_CASE("wxFile::Special", "[file][linux][special-file]")
     CHECK( fileProc.ReadAll(&s) );
     CHECK( !s.empty() );
 
-    // All files in /sys seem to have size of 4KiB currently, even if they
-    // don't have that much data in them.
+    // All files in /sys have the size of one kernel page, even if they don't
+    // have that much data in them.
+    const long pageSize = sysconf(_SC_PAGESIZE);
+
     wxFile fileSys("/sys/power/state");
-    CHECK( fileSys.Length() == sysconf(_SC_PAGESIZE) );
+    CHECK( fileSys.Length() == pageSize );
     CHECK( fileSys.IsOpened() );
     CHECK( fileSys.ReadAll(&s) );
     CHECK( !s.empty() );
-    CHECK( s.length() < 4096 );
+    CHECK( s.length() < pageSize );
 }
 
 #endif // __LINUX__
diff --git a/tests/filename/filenametest.cpp b/tests/filename/filenametest.cpp
index 2928b8d4cb..1db0edc52d 100644
--- a/tests/filename/filenametest.cpp
+++ b/tests/filename/filenametest.cpp
@@ -1059,7 +1059,8 @@ TEST_CASE("wxFileName::GetSizeSpecial", "[filename][linux][special-file]")
     INFO( "size of /proc/kcore=" << size );
     CHECK( size > 0 );
 
-    // All files in /sys seem to have size of 4KiB currently.
+    // All files in /sys are one page in size, irrespectively of the size of
+    // their actual contents.
     CHECK( wxFileName::GetSize("/sys/power/state") == sysconf(_SC_PAGESIZE) );
 }