diff --git a/src/cascadia/TerminalSettingsModel/defaults.json b/src/cascadia/TerminalSettingsModel/defaults.json
index cdd5d6e78dd..360f37afaad 100644
--- a/src/cascadia/TerminalSettingsModel/defaults.json
+++ b/src/cascadia/TerminalSettingsModel/defaults.json
@@ -174,6 +174,7 @@
             "foreground": "#383A42",
             "background": "#FAFAFA",
             "cursorColor": "#4F525D",
+            "selectionBackground": "#4F525D",
             "black": "#383A42",
             "red": "#E45649",
             "green": "#50A14F",
@@ -218,6 +219,7 @@
             "foreground": "#657B83",
             "background": "#FDF6E3",
             "cursorColor": "#002B36",
+            "selectionBackground": "#073642",
             "black": "#002B36",
             "red": "#DC322F",
             "green": "#859900",
@@ -262,6 +264,7 @@
             "foreground": "#555753",
             "background": "#FFFFFF",
             "cursorColor": "#000000",
+            "selectionBackground": "#555753",
             "black": "#000000",
             "red": "#CC0000",
             "green": "#4E9A06",