diff --git a/pdf2djvu.spec b/pdf2djvu.spec
index afe195a..6846958 100644
--- a/pdf2djvu.spec
+++ b/pdf2djvu.spec
@@ -1,11 +1,13 @@
 Name:           pdf2djvu
 Version:        0.7.4
-Release:        6%{?dist}
+Release:        7%{?dist}
 Summary:        PDF to DjVu converter
 Group:          Applications/Publishing
 License:        GPLv2+
 URL:            http://pdf2djvu.googlecode.com/
 Source0:        http://pdf2djvu.googlecode.com/files/%{name}_%{version}.tar.gz
+Patch1:         throw-specifier.patch
+
 BuildRoot:      %{_tmppath}/%{name}-%{version}-%{release}-root-%(%{__id_u} -n)
 
 BuildRequires:  djvulibre-devel djvulibre
@@ -24,6 +26,8 @@ metadata.
 %prep
 %setup -q
 
+%patch1 -p1 -b .throw-specifier
+
 %build
 %configure
 make %{?_smp_mflags}
@@ -46,6 +50,9 @@ rm -rf $RPM_BUILD_ROOT
 
 
 %changelog
+* Tue Mar 15 2011 Marek Kasik <mkasik@redhat.com> - 0.7.4-7
+- Correct definition of derived class.
+
 * Sun Mar 13 2011 Marek Kasik <mkasik@redhat.com> - 0.7.4-6
 - Rebuild (poppler-0.16.3)
 
diff --git a/throw-specifier.patch b/throw-specifier.patch
new file mode 100644
index 0000000..b681dfe
--- /dev/null
+++ b/throw-specifier.patch
@@ -0,0 +1,11 @@
+--- pdf2djvu-0.7.4/system.hh	2010-06-12 22:20:36.000000000 +0200
++++ pdf2djvu-0.7.4/system.hh	2011-03-15 14:58:35.000000000 +0100
+@@ -162,6 +162,8 @@ private:
+ public:
+   explicit ExistingFile(const std::string &name);
+   ExistingFile(const Directory& directory, const std::string &name);
++  virtual ~ExistingFile() throw ()
++  { }
+ };
+ 
+ #if WIN32