diff --git a/target/tricore/translate.c b/target/tricore/translate.c
index 6712d98f6e..74faad4794 100644
--- a/target/tricore/translate.c
+++ b/target/tricore/translate.c
@@ -5339,6 +5339,7 @@ static void decode_rcrw_insert(DisasContext *ctx)
 
     switch (op2) {
     case OPC2_32_RCRW_IMASK:
+        CHECK_REG_PAIR(r4);
         tcg_gen_andi_tl(temp, cpu_gpr_d[r3], 0x1f);
         tcg_gen_movi_tl(temp2, (1 << width) - 1);
         tcg_gen_shl_tl(cpu_gpr_d[r4 + 1], temp2, temp);