diff --git a/docs/changes.txt b/docs/changes.txt
index 81d4fb71ab..8671524444 100644
--- a/docs/changes.txt
+++ b/docs/changes.txt
@@ -201,6 +201,7 @@ Unix:
 
 - Unicode compilation fix in wxDateTime
 - typo in configure which broke AIX build fixed (Swengtoo)
+- fixed priorities of mailcap entries (David Hart)
 
 wxMSW:
 
diff --git a/src/unix/mimetype.cpp b/src/unix/mimetype.cpp
index 77ab82d6e8..b96e3e6486 100644
--- a/src/unix/mimetype.cpp
+++ b/src/unix/mimetype.cpp
@@ -2559,7 +2559,7 @@ bool wxMimeTypesManagerImpl::ReadMailcap(const wxString& strFileName,
 
             // and if we have, was it in this file?
             overwrite = nIndex == wxNOT_FOUND ||
-                            aIndicesSeenHere.Index(nIndex) != wxNOT_FOUND;
+                            aIndicesSeenHere.Index(nIndex) == wxNOT_FOUND;
         }
 
         wxLogTrace(TRACE_MIME, _T("mailcap %s: %s [%s]"),