diff --git a/doc/api/next_api_changes/2018-08-17-AL-deprecations.rst b/doc/api/next_api_changes/2018-08-17-AL-deprecations.rst
index 083f78e9d375..c195dfd2d057 100644
--- a/doc/api/next_api_changes/2018-08-17-AL-deprecations.rst
+++ b/doc/api/next_api_changes/2018-08-17-AL-deprecations.rst
@@ -6,4 +6,5 @@ The following API elements are deprecated:
 - ``get_py2exe_datafiles``, ``tk_window_focus``,
 - ``backend_ps.PsBackendHelper``, ``backend_ps.ps_backend_helper``,
 - ``cbook.iterable``,
+- ``font_manager.OSXInstalledFonts``,
 - ``mlab.demean``,
diff --git a/lib/matplotlib/font_manager.py b/lib/matplotlib/font_manager.py
index b95a9f1b1ee6..d3ecae9f653d 100644
--- a/lib/matplotlib/font_manager.py
+++ b/lib/matplotlib/font_manager.py
@@ -209,6 +209,7 @@ def win32InstalledFonts(directory=None, fontext='ttf'):
     return None
 
 
+@cbook.deprecated("3.1")
 def OSXInstalledFonts(directories=None, fontext='ttf'):
     """Get list of font files on OS X."""
     if directories is None:
@@ -263,10 +264,9 @@ def findSystemFonts(fontpaths=None, fontext='ttf'):
             fontfiles.update(win32InstalledFonts(fontext=fontext))
         else:
             fontpaths = X11FontDirectories
-            fontfiles.update(get_fontconfig_fonts(fontext))
-            # check for OS X & load its fonts if present
             if sys.platform == 'darwin':
-                fontfiles.update(OSXInstalledFonts(fontext=fontext))
+                fontpaths = [*X11FontDirectories, *OSXFontDirectories]
+            fontfiles.update(get_fontconfig_fonts(fontext))
 
     elif isinstance(fontpaths, str):
         fontpaths = [fontpaths]