diff --git a/dlls/dwrite/opentype.c b/dlls/dwrite/opentype.c
index 3205b7fd92..3fe4690d7c 100644
--- a/dlls/dwrite/opentype.c
+++ b/dlls/dwrite/opentype.c
@@ -1923,8 +1923,14 @@ HRESULT opentype_get_font_signature(struct file_stream_desc *stream_desc, FONTSI
         fontsig->fsUsb[2] = GET_BE_DWORD(tt_os2->ulUnicodeRange3);
         fontsig->fsUsb[3] = GET_BE_DWORD(tt_os2->ulUnicodeRange4);
 
-        fontsig->fsCsb[0] = GET_BE_DWORD(tt_os2->ulCodePageRange1);
-        fontsig->fsCsb[1] = GET_BE_DWORD(tt_os2->ulCodePageRange2);
+        if (GET_BE_WORD(tt_os2->version) == 0) {
+            fontsig->fsCsb[0] = 0;
+            fontsig->fsCsb[1] = 0;
+        }
+        else {
+            fontsig->fsCsb[0] = GET_BE_DWORD(tt_os2->ulCodePageRange1);
+            fontsig->fsCsb[1] = GET_BE_DWORD(tt_os2->ulCodePageRange2);
+        }
 
         IDWriteFontFileStream_ReleaseFileFragment(stream_desc->stream, os2_context);
     }
diff --git a/dlls/dwrite/tests/font.c b/dlls/dwrite/tests/font.c
index 12327a5f0f..8df6f44194 100644
--- a/dlls/dwrite/tests/font.c
+++ b/dlls/dwrite/tests/font.c
@@ -6267,8 +6267,14 @@ static void get_expected_fontsig(IDWriteFont *font, FONTSIGNATURE *fontsig)
         fontsig->fsUsb[2] = GET_BE_DWORD(tt_os2->ulUnicodeRange3);
         fontsig->fsUsb[3] = GET_BE_DWORD(tt_os2->ulUnicodeRange4);
 
-        fontsig->fsCsb[0] = GET_BE_DWORD(tt_os2->ulCodePageRange1);
-        fontsig->fsCsb[1] = GET_BE_DWORD(tt_os2->ulCodePageRange2);
+        if (GET_BE_WORD(tt_os2->version) == 0) {
+            fontsig->fsCsb[0] = 0;
+            fontsig->fsCsb[1] = 0;
+        }
+        else {
+            fontsig->fsCsb[0] = GET_BE_DWORD(tt_os2->ulCodePageRange1);
+            fontsig->fsCsb[1] = GET_BE_DWORD(tt_os2->ulCodePageRange2);
+        }
 
         IDWriteFontFace_ReleaseFontTable(fontface, os2_context);
     }