diff --git a/test/misc.cpp b/test/misc.cpp
index 9f4a632..77d7361 100644
--- a/test/misc.cpp
+++ b/test/misc.cpp
@@ -874,12 +874,14 @@ CYBOZU_TEST_AUTO(vaddph)
 			vaddph(zmm0, zmm1, ptr[rax+64]);
 			vaddph(ymm0, ymm1, ptr[rax+64]);
 			vaddph(xmm0, xmm1, ptr[rax+64]);
+			vaddsh(xmm0, xmm15, ptr[rax+64]);
 		}
 	} c;
 	const uint8_t tbl[] = {
 		0x62, 0xF5, 0x74, 0x48, 0x58, 0x40, 0x01,
 		0x62, 0xF5, 0x74, 0x28, 0x58, 0x40, 0x02,
 		0x62, 0xF5, 0x74, 0x08, 0x58, 0x40, 0x04,
+		0x62, 0xF5, 0x06, 0x08, 0x58, 0x40, 0x20,
 	};
 	const size_t n = sizeof(tbl) / sizeof(tbl[0]);
 	CYBOZU_TEST_EQUAL(c.getSize(), n);