diff --git a/src/mbyte.c b/src/mbyte.c
index 0abb1648fe..e56a2c2bae 100644
--- a/src/mbyte.c
+++ b/src/mbyte.c
@@ -1545,6 +1545,15 @@ utf_char2cells(int c)
 	{0x1f6e9, 0x1f6e9},
 	{0x1f6f0, 0x1f6f0},
 	{0x1f6f3, 0x1f6f3}
+#ifdef FEAT_GUI_MACVIM
+	// Include SF Symbols characters, which should be rendered as
+	// double-width. All of them are in the Supplementary Private Use Area-B
+	// range. The exact range was determined by downloading the "SF Symbols"
+	// app from Apple, and then selecting all symbols, copying them out, and
+	// inspecting the unicode values of them.
+	,
+	{0x100000, 0x100d7f}
+#endif
     };
 
     if (c >= 0x100)