diff --git a/target/i386/tcg/decode-new.c.inc b/target/i386/tcg/decode-new.c.inc
index 8a821604f0..6099919bc5 100644
--- a/target/i386/tcg/decode-new.c.inc
+++ b/target/i386/tcg/decode-new.c.inc
@@ -782,6 +782,17 @@ static void decode_0F2D(DisasContext *s, CPUX86State *env, X86OpEntry *entry, ui
     *entry = *decode_by_prefix(s, opcodes_0F2D);
 }
 
+static void decode_VxCOMISx(DisasContext *s, CPUX86State *env, X86OpEntry *entry, uint8_t *b)
+{
+    /*
+     * VUCOMISx and VCOMISx are different and use no-prefix and 0x66 for SS and SD
+     * respectively.  Scalar values usually are associated with 0xF2 and 0xF3, for
+     * which X86_VEX_REPScalar exists, but here it has to be decoded by hand.
+     */
+    entry->s1 = entry->s2 = (s->prefix & PREFIX_DATA ? X86_SIZE_sd : X86_SIZE_ss);
+    entry->gen = (*b == 0x2E ? gen_VUCOMI : gen_VCOMI);
+}
+
 static void decode_sse_unary(DisasContext *s, CPUX86State *env, X86OpEntry *entry, uint8_t *b)
 {
     if (!(s->prefix & (PREFIX_REPZ | PREFIX_REPNZ))) {
@@ -870,8 +881,8 @@ static const X86OpEntry opcodes_0F[256] = {
     [0x2B] = X86_OP_GROUP0(0F2B),
     [0x2C] = X86_OP_GROUP0(0F2C),
     [0x2D] = X86_OP_GROUP0(0F2D),
-    [0x2E] = X86_OP_ENTRY3(VUCOMI,     None,None, V,x, W,x,  vex4 p_00_66),
-    [0x2F] = X86_OP_ENTRY3(VCOMI,      None,None, V,x, W,x,  vex4 p_00_66),
+    [0x2E] = X86_OP_GROUP3(VxCOMISx,   None,None, V,x, W,x,  vex3 p_00_66), /* VUCOMISS/SD */
+    [0x2F] = X86_OP_GROUP3(VxCOMISx,   None,None, V,x, W,x,  vex3 p_00_66), /* VCOMISS/SD */
 
     [0x38] = X86_OP_GROUP0(0F38),
     [0x3a] = X86_OP_GROUP0(0F3A),