diff --git a/src/common/utilscmn.cpp b/src/common/utilscmn.cpp
index 9b5d7cac6b..57f68bc340 100644
--- a/src/common/utilscmn.cpp
+++ b/src/common/utilscmn.cpp
@@ -943,7 +943,8 @@ bool wxLaunchDefaultApplication(const wxString& document, int flags)
 
 #ifdef __WXMAC__
     static const char * const OPEN_CMD = "/usr/bin/open";
-    if ( wxFileExists(OPEN_CMD) && wxExecute(OPEN_CMD + " " + document) )
+    if ( wxFileExists(OPEN_CMD) &&
+            wxExecute(wxString(OPEN_CMD) + " " + document) )
         return true;
 #elif defined(__UNIX__)
     // Our best best is to use xdg-open from freedesktop.org cross-desktop