diff --git a/src/module/io.c b/src/module/io.c
index ac5a5f6d..d3ae5800 100644
--- a/src/module/io.c
+++ b/src/module/io.c
@@ -522,6 +522,7 @@ void stdinIsRawSet(WrenVM* vm)
     // Can't set raw mode when not talking to a TTY.
     // TODO: Make this a runtime error?
   }
+  wrenSetSlotBool(vm, 0, isStdinRaw);
 }
 
 void stdinIsTerminal(WrenVM* vm)
diff --git a/test/io/stdin/is_raw.wren b/test/io/stdin/is_raw.wren
index 556cbf1d..5853d348 100644
--- a/test/io/stdin/is_raw.wren
+++ b/test/io/stdin/is_raw.wren
@@ -26,3 +26,6 @@ for (i in 1..4) {
 // TODO: This doesn't actually detect a visible difference between raw and
 // non-raw mode. Maybe add support to the test runner for writing non-printing
 // characters to stdin?
+
+System.print(Stdin.isRaw=false) // expect: false
+System.print(Stdin.isRaw=true) // expect: true
\ No newline at end of file