diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
index c5789365d3b..eb371d0eb8c 100644
--- a/gcc/config/i386/i386.c
+++ b/gcc/config/i386/i386.c
@@ -21989,6 +21989,10 @@ ix86_libgcc_floating_mode_supported_p (scalar_float_mode mode)
 static bool
 ix86_vector_mode_supported_p (machine_mode mode)
 {
+  /* For ia32, scalar TImode isn't supported and so V1TImode shouldn't be
+     either.  */
+  if (!TARGET_64BIT && GET_MODE_INNER (mode) == TImode)
+    return false;
   if (TARGET_SSE && VALID_SSE_REG_MODE (mode))
     return true;
   if (TARGET_SSE2 && VALID_SSE2_REG_MODE (mode))
diff --git a/gcc/testsuite/gcc.target/i386/pr103020.c b/gcc/testsuite/gcc.target/i386/pr103020.c
new file mode 100644
index 00000000000..75253c72c9a
--- /dev/null
+++ b/gcc/testsuite/gcc.target/i386/pr103020.c
@@ -0,0 +1,11 @@
+/* PR target/103020 */
+/* { dg-do compile { target { ! int128 } } } */
+/* { dg-additional-options "-mavx512f" } */
+
+typedef int TI __attribute__((mode (TI)));	/* { dg-error "unable to emulate" } */
+typedef int V1TI __attribute__((mode (V1TI)));	/* { dg-error "unable to emulate" } */
+typedef int V2TI __attribute__((mode (V2TI)));	/* { dg-error "unable to emulate" } */
+typedef int V4TI __attribute__((mode (V4TI)));	/* { dg-error "unable to emulate" } */
+/* { dg-warning "is deprecated" "V1TI" { target *-*-* } .-3 } */
+/* { dg-warning "is deprecated" "V2TI" { target *-*-* } .-3 } */
+/* { dg-warning "is deprecated" "V4TI" { target *-*-* } .-3 } */