--- a/modules/libjar/nsZipArchive.h
+++ b/modules/libjar/nsZipArchive.h
@@ -15,17 +15,17 @@
 #include "zlib.h"
 #include "zipstruct.h"
 #include "nsAutoPtr.h"
 #include "nsIFile.h"
 #include "nsISupportsImpl.h" // For mozilla::ThreadSafeAutoRefCnt
 #include "mozilla/FileUtils.h"
 #include "mozilla/FileLocation.h"
 
-#if defined(XP_WIN) && defined(_MSC_VER)
+#ifdef HAVE_SEH_EXCEPTIONS
 #define MOZ_WIN_MEM_TRY_BEGIN __try {
 #define MOZ_WIN_MEM_TRY_CATCH(cmd) }                                \
   __except(GetExceptionCode()==EXCEPTION_IN_PAGE_ERROR ?            \
            EXCEPTION_EXECUTE_HANDLER : EXCEPTION_CONTINUE_SEARCH)   \
   {                                                                 \
     NS_WARNING("EXCEPTION_IN_PAGE_ERROR in " __FUNCTION__);         \
     cmd;                                                            \
   }