diff --git a/tests/hlsl/cast-to-half.shader_test b/tests/hlsl/cast-to-half.shader_test
index a6846c084..f0f343341 100644
--- a/tests/hlsl/cast-to-half.shader_test
+++ b/tests/hlsl/cast-to-half.shader_test
@@ -52,12 +52,10 @@ float4 main() : sv_target
 [test]
 uniform 0 float4 65536.0 32768.0 65536.0 32768.0
 draw quad
-% The shader runner doesn't support floating-point special literals like "inf",
-% but numbers beyond FLOAT_MAX consistently result in inf.
-probe (0, 0) rgba(1.0e39, 1.0e39, 1.0e39, 16384.0)
+probe (0, 0) f32(inf, inf, inf, 16384.0)
 uniform 0 float4 -65536.0 -32768.0 -65536.0 -32768.0
 draw quad
-probe (0, 0) rgba(-1.0e39, -1.0e39, -1.0e39, -16384.0)
+probe (0, 0) f32(-inf, -inf, -inf, -16384.0)
 uniform 0 float4 0.000062 5.0e-8 0.000062 5.0e-8
 draw quad
 probe (0, 0) rgba(0.00012397766, 1.1920929e-7, 0.000030994415, 0.0) 1