diff --git a/layout/inspector/tests/test_bug877690.html b/layout/inspector/tests/test_bug877690.html
index 773ea4f80a2a..6dc3f4b6ba9b 100644
--- a/layout/inspector/tests/test_bug877690.html
+++ b/layout/inspector/tests/test_bug877690.html
@@ -92,7 +92,7 @@ function do_test() {
       "repeat-x", "repeat-y", "fixed", "scroll", "center", "top", "bottom", "left", "right",
       "border-box", "padding-box", "content-box", "border-box", "padding-box", "content-box", "contain",
       "cover" ];
-  ok(testValues(values, expected), "Shorthand proprety values.");
+  ok(testValues(values, expected), "Shorthand property values.");
 
   // test keywords only
   var prop = "border-top";