diff --git a/Grid/simd/Grid_a64fx-fixedsize.h b/Grid/simd/Grid_a64fx-fixedsize.h
index deeb5c78..a8c2b978 100644
--- a/Grid/simd/Grid_a64fx-fixedsize.h
+++ b/Grid/simd/Grid_a64fx-fixedsize.h
@@ -436,7 +436,7 @@ struct PrecisionChange {
     vecf sb_v = svcvt_f32_x(pg1d, b);
     return svuzp1(sa_v, sb_v);
   }
-  static inline void StoD (vecf s,vecd &a,vecd &b) {
+  static inline void StoD (svfloat32_t s,svfloat64_t &a,svfloat64_t &b) {
     pred pg1d = acle<double>::pg1();
     vecf sa_v = svzip1(s, s);
     vecf sb_v = svzip2(s, s);
diff --git a/Grid/simd/Grid_vector_types.h b/Grid/simd/Grid_vector_types.h
index c38fdd9e..03cda20d 100644
--- a/Grid/simd/Grid_vector_types.h
+++ b/Grid/simd/Grid_vector_types.h
@@ -967,7 +967,7 @@ accelerator_inline void precisionChange(vRealD    *out,vRealF    *in,int nvec)
     // 961 |     Optimization::PrecisionChange::StoD(in[m].v,out[n].v,out[n+1].v);
     //  |                                                 ~~~~~~~^
     // Optimization::PrecisionChange::StoD(in[m].v,out[n].v,out[n+1].v);
-    Optimization::PrecisionChange::StoD(in[m].v,&out[n].v,&out[n+1].v);
+    Optimization::PrecisionChange::StoD(in[m].v,out[n].v,out[n+1].v);
   }
 }
 accelerator_inline void precisionChange(vRealD    *out,vRealH    *in,int nvec)