diff --git a/Userland/Libraries/LibJS/Tests/test-common.js b/Userland/Libraries/LibJS/Tests/test-common.js
index 4d9ae071c9..0bc84cf4c6 100644
--- a/Userland/Libraries/LibJS/Tests/test-common.js
+++ b/Userland/Libraries/LibJS/Tests/test-common.js
@@ -174,13 +174,19 @@ class ExpectationError extends Error {
 
         toBeTrue() {
             this.__doMatcher(() => {
-                this.__expect(this.target === true);
+                this.__expect(
+                    this.target === true,
+                    () => `toBeTrue: expected target to be true, got _${String(this.target)}_`
+                );
             });
         }
 
         toBeFalse() {
             this.__doMatcher(() => {
-                this.__expect(this.target === false);
+                this.__expect(
+                    this.target === false,
+                    () => `toBeTrue: expected target to be false, got _${String(this.target)}_`
+                );
             });
         }