diff --git a/luna/include/luna/Check.h b/luna/include/luna/Check.h
index ce3b0472..07c5279c 100644
--- a/luna/include/luna/Check.h
+++ b/luna/include/luna/Check.h
@@ -19,6 +19,10 @@
         if (!(expr)) [[unlikely]] { __check_failed(location, message); }                                               \
     } while (0)
 
+// Fail with an error message and location.
+#define fail(message) __check_failed(SourceLocation::current(), message)
+#define fail_at(location, message) __check_failed(location, message)
+
 // Like assert(), but always enabled.
 #define check(expr)                                                                                                    \
     do {                                                                                                               \
diff --git a/luna/src/UBSAN.cpp b/luna/src/UBSAN.cpp
index 15e52676..4f3c25d2 100644
--- a/luna/src/UBSAN.cpp
+++ b/luna/src/UBSAN.cpp
@@ -7,7 +7,7 @@ using namespace UBSAN::UBInfo;
 
 [[noreturn]] void ub_panic(SourceLocation caller = SourceLocation::current())
 {
-    expect_at(false, caller, "Undefined behavior");
+    fail_at(caller, "Undefined behavior");
 }
 
 #define DISPLAY(loc) loc.file, loc.line, loc.column