Index: WebKit/haiku/WebPositive/SettingsWindow.cpp
===================================================================
--- WebKit/haiku/WebPositive/SettingsWindow.cpp	(revision 521)
+++ WebKit/haiku/WebPositive/SettingsWindow.cpp	(working copy)
@@ -53,6 +53,7 @@
 #include "SettingsKeys.h"
 #include "SettingsMessage.h"
 #include "WebSettings.h"
+#include "FontPlatformData.h"
 
 
 #undef B_TRANSLATE_CONTEXT
@@ -639,6 +640,12 @@
 	BWebSettings::Default()->SetDefaultStandardFontSize(standardFontSize);
 	BWebSettings::Default()->SetDefaultFixedFontSize(fixedFontSize);
 
+	// Set FallBack fonts
+	WebCore::FontPlatformData::SetFallBackSerifFont(fSerifFontView->Font());
+	WebCore::FontPlatformData::SetFallBackSansSerifFont(fSansSerifFontView->Font());
+	WebCore::FontPlatformData::SetFallBackFixedFont(fFixedFontView->Font());
+	WebCore::FontPlatformData::SetFallBackFont(fStandardFontView->Font());
+
 	if (fUseProxyCheckBox->Value() == B_CONTROL_ON) {
 		BWebSettings::Default()->SetProxyInfo(fProxyAddressControl->Text(),
 			proxyPort, B_PROXY_TYPE_HTTP, "", "");
Index: WebCore/platform/graphics/haiku/FontPlatformData.h
===================================================================
--- WebCore/platform/graphics/haiku/FontPlatformData.h	(revision 521)
+++ WebCore/platform/graphics/haiku/FontPlatformData.h	(working copy)
@@ -43,6 +43,10 @@
     FontPlatformData(const FontDescription&, const AtomicString& family);
     FontPlatformData(float size, bool bold, bool oblique);
     FontPlatformData(const FontPlatformData&);
+	static void SetFallBackSerifFont(const BFont& font);
+	static void SetFallBackSansSerifFont(const BFont& font);
+	static void SetFallBackFixedFont(const BFont& font);
+	static void SetFallBackFont(const BFont& font);
 
     ~FontPlatformData();
 
@@ -62,8 +66,14 @@
     String description() const;
 
 private:
+	static void findMatchingFontFamily(const AtomicString& familyName, font_family* fontFamily);
     class FontPlatformDataPrivate;
     FontPlatformDataPrivate* m_data;
+
+	static font_family m_FallbackSerifFontFamily;
+	static font_family m_FallbackSansSerifFontFamily;
+	static font_family m_FallbackFixedFontFamily;
+	static font_family m_FallbackFontFamily;
 };
 
 } // namespace WebCore
Index: WebCore/platform/graphics/haiku/FontPlatformDataHaiku.cpp
===================================================================
--- WebCore/platform/graphics/haiku/FontPlatformDataHaiku.cpp	(revision 521)
+++ WebCore/platform/graphics/haiku/FontPlatformDataHaiku.cpp	(working copy)
@@ -26,8 +26,13 @@
 
 #include "AtomicString.h"
 #include <wtf/text/CString.h>
+#include <String.h>
 
 namespace WebCore {
+font_family FontPlatformData::m_FallbackSerifFontFamily= "DejaVu Sans";
+font_family FontPlatformData::m_FallbackSansSerifFontFamily = "DejaVu Serif";
+font_family FontPlatformData::m_FallbackFixedFontFamily = "DejaVu Mono";
+font_family FontPlatformData::m_FallbackFontFamily = "DejaVu Serif";
 
 static inline bool isEmtpyValue(const float size, const bool bold, const bool oblique)
 {
@@ -35,21 +40,22 @@
     return !bold && !oblique && size == 0;
 }
 
-static void findMatchingFontFamily(const AtomicString& familyName, font_family* fontFamily)
+void
+FontPlatformData::findMatchingFontFamily(const AtomicString& familyName, font_family* fontFamily)
 {
     if (BFont().SetFamilyAndStyle(familyName.string().utf8().data(), 0) == B_OK)
         strncpy(*fontFamily, familyName.string().utf8().data(), B_FONT_FAMILY_LENGTH + 1);
     else {
         // If no font family is found for the given name, we use a generic font.
         if (familyName.contains("Sans", false) != B_ERROR)
-            strncpy(*fontFamily, "DejaVu Sans", B_FONT_FAMILY_LENGTH + 1);
+            strncpy(*fontFamily, m_FallbackSansSerifFontFamily, B_FONT_FAMILY_LENGTH + 1);
         else if (familyName.contains("Serif", false) != B_ERROR)
-            strncpy(*fontFamily, "DejaVu Serif", B_FONT_FAMILY_LENGTH + 1);
+            strncpy(*fontFamily, m_FallbackSerifFontFamily, B_FONT_FAMILY_LENGTH + 1);
         else if (familyName.contains("Mono", false) != B_ERROR)
-            strncpy(*fontFamily, "DejaVu Mono", B_FONT_FAMILY_LENGTH + 1);
+            strncpy(*fontFamily, m_FallbackFixedFontFamily, B_FONT_FAMILY_LENGTH + 1);
         else {
             // This is the fallback font.
-            strncpy(*fontFamily, "DejaVu Serif", B_FONT_FAMILY_LENGTH + 1);
+            strncpy(*fontFamily, m_FallbackFontFamily, B_FONT_FAMILY_LENGTH + 1);
         }
     }
 }
@@ -307,5 +313,31 @@
     return String(fontFamily) + "/" + String(fontStyle) + String::format("/%.1f/%d&%d", size, isBold, isOblique);
 }
 
+void
+FontPlatformData::SetFallBackSerifFont(const BFont& font)
+{
+	font_style style;
+	font.GetFamilyAndStyle(&m_FallbackSerifFontFamily, &style) ;
+}
+
+void
+FontPlatformData::SetFallBackSansSerifFont(const BFont& font)
+{
+	font_style style;
+	font.GetFamilyAndStyle(&m_FallbackSansSerifFontFamily, &style) ;
+}
+
+void
+FontPlatformData::SetFallBackFixedFont(const BFont& font)
+{
+	font_style style;
+	font.GetFamilyAndStyle(&m_FallbackFixedFontFamily, &style) ;
+}
+void
+FontPlatformData::SetFallBackFont(const BFont& font)
+{
+	font_style style;
+	font.GetFamilyAndStyle(&m_FallbackFontFamily, &style) ;
+}
 } // namespace WebCore