diff --git a/target/arm/vec_helper.c b/target/arm/vec_helper.c
index 6aa2ca0827..a483841add 100644
--- a/target/arm/vec_helper.c
+++ b/target/arm/vec_helper.c
@@ -747,6 +747,7 @@ void HELPER(NAME)(void *vd, void *vn, void *vm, void *stat, uint32_t desc) \
             d[i + j] = TYPE##_mul(n[i + j], mm, stat);                     \
         }                                                                  \
     }                                                                      \
+    clear_tail(d, oprsz, simd_maxsz(desc));                                \
 }
 
 DO_MUL_IDX(gvec_fmul_idx_h, float16, H2)
@@ -771,6 +772,7 @@ void HELPER(NAME)(void *vd, void *vn, void *vm, void *va,                  \
                                      mm, a[i + j], 0, stat);               \
         }                                                                  \
     }                                                                      \
+    clear_tail(d, oprsz, simd_maxsz(desc));                                \
 }
 
 DO_FMLA_IDX(gvec_fmla_idx_h, float16, H2)