diff --git a/src/mathed/math_fracinset.C b/src/mathed/math_fracinset.C
index 34e979af52..e709d190d7 100644
--- a/src/mathed/math_fracinset.C
+++ b/src/mathed/math_fracinset.C
@@ -146,6 +146,8 @@ string MathFracInset::name() const
 	case ATOP:
 		return "atop";
 	}
+	// shut up stupid compiler
+	return string();
 }