diff --git a/tests/strings/unicode.cpp b/tests/strings/unicode.cpp
index d6e28164d7..1fb8b358bc 100644
--- a/tests/strings/unicode.cpp
+++ b/tests/strings/unicode.cpp
@@ -387,12 +387,12 @@ void UnicodeTestCase::ConversionUTF16()
     // terminate the string, this exposed a bug in our conversion code which
     // got confused in this case
     size_t len;
-    conv.cMB2WC("\x01\0\0B\0C" /* A macron BC */, 6, &len);
+    conv.cMB2WC("\x01\0\0B\0C\0" /* A macron BC */, 6, &len);
     CPPUNIT_ASSERT_EQUAL( 3, len );
 
     // Another one: verify that the length of the resulting string is computed
     // correctly when there is a surrogate in the input.
-    wxMBConvUTF16BE().cMB2WC("\xd8\x03\xdc\x01" /* OLD TURKIC LETTER YENISEI A */, wxNO_LEN, &len);
+    wxMBConvUTF16BE().cMB2WC("\xd8\x03\xdc\x01\0" /* OLD TURKIC LETTER YENISEI A */, wxNO_LEN, &len);
     CPPUNIT_ASSERT_EQUAL( 1, len );
 }
 
@@ -416,7 +416,7 @@ void UnicodeTestCase::ConversionUTF32()
     }
 
     size_t len;
-    conv.cMB2WC("\0\0\x01\0\0\0\0B\0\0\0C" /* A macron BC */, 12, &len);
+    conv.cMB2WC("\0\0\x01\0\0\0\0B\0\0\0C\0" /* A macron BC */, 12, &len);
     CPPUNIT_ASSERT_EQUAL( 3, len );
 }