diff --git a/test_conformance/math_brute_force/reference_math.cpp b/test_conformance/math_brute_force/reference_math.cpp
index 16db3d67..a0a3d65d 100644
--- a/test_conformance/math_brute_force/reference_math.cpp
+++ b/test_conformance/math_brute_force/reference_math.cpp
@@ -2321,7 +2321,7 @@ static inline double_double accum_d(double_double a, double b)
 
 static inline double_double add_dd(double_double a, double_double b)
 {
-    double_double r = { -0.0 - 0.0 };
+    double_double r = { -0.0, -0.0 };
 
     if (isinf(a.hi) || isinf(b.hi) || isnan(a.hi) || isnan(b.hi) || 0.0 == a.hi
         || 0.0 == b.hi)