diff --git a/arch/powerpc/lib/test_emulate_step.c b/arch/powerpc/lib/test_emulate_step.c
index 31065e986ff0ce0bf09afc4e71a4cb79bc99bb9e..7d11ab5ef86ca73a982ce7f1f4860ac0bf2936bd 100644
--- a/arch/powerpc/lib/test_emulate_step.c
+++ b/arch/powerpc/lib/test_emulate_step.c
@@ -1130,6 +1130,16 @@ static struct compute_test compute_tests[] = {
 				.regs = {
 					.gpr[21] = 0,
 				}
+			},
+			/* Invalid instruction form with R = 1 and RA != 0 */
+			{
+				.descr = "RA = R22(0), SI = 0, R = 1",
+				.instr = TEST_PADDI(21, 22, 0, 1),
+				.flags = NEGATIVE_TEST,
+				.regs = {
+					.gpr[21] = 0,
+					.gpr[22] = 0,
+				}
 			}
 		}
 	}