diff --git a/kio/kio/kmimetype.cpp b/kio/kio/kmimetype.cpp
index c3fc91087..f63903c27 100644
--- a/kio/kio/kmimetype.cpp
+++ b/kio/kio/kmimetype.cpp
@@ -221,8 +221,12 @@ KMimeType::Ptr KMimeType::findByURL( const KURL& _url, mode_t _mode,
                     KMimeMagicResult* result =
                             KMimeMagic::self()->findFileType( path );
 
-                    if ( result && result->isValid() && result->accuracy() > 0 )
-                        return mimeType( result->mimeType() );
+                    if ( result && result->isValid() && result->accuracy() > 0 ) {
+                        KMimeType::Ptr resultMime = mimeType( result->mimeType() );
+                        if (resultMime->patternsAccuracy() > 0) {
+                            return resultMime;
+                        }
+                    }
                 }
             }
 
diff --git a/mimetypes/application/octet-stream.desktop b/mimetypes/application/octet-stream.desktop
index 3b2859890..0af521098 100644
--- a/mimetypes/application/octet-stream.desktop
+++ b/mimetypes/application/octet-stream.desktop
@@ -1,6 +1,7 @@
 [Desktop Entry]
 Type=MimeType
 MimeType=application/octet-stream
+X-KDE-PatternsAccuracy=0
 Comment=Unknown
 Comment[af]=Onbekende
 Comment[ar]=غير معروف