diff --git a/src/backend/linalg_internal_interface.cpp b/src/backend/linalg_internal_interface.cpp
index a90b483be..ac2115425 100644
--- a/src/backend/linalg_internal_interface.cpp
+++ b/src/backend/linalg_internal_interface.cpp
@@ -225,8 +225,8 @@ namespace cytnx {
       Trace_ii[Type.Bool] = Trace_internal_b;
 
       //================
-      Outer_ii =
-        std::vector<std::vector<Outerfunc_oii>>(N_Type, std::vector<Outerfunc_oii>(N_Type, nullptr));
+      Outer_ii = std::vector<std::vector<Outerfunc_oii>>(
+        N_Type, std::vector<Outerfunc_oii>(N_Type, nullptr));
 
       Outer_ii[Type.ComplexDouble][Type.ComplexDouble] = Outer_internal_cdtcd;
       Outer_ii[Type.ComplexDouble][Type.ComplexFloat] = Outer_internal_cdtcf;
@@ -720,8 +720,8 @@ namespace cytnx {
       cuTrace_ii[Type.Bool] = cuTrace_internal_b;
       //================
 
-      cuOuter_ii =
-        std::vector<std::vector<Outerfunc_oii>>(N_Type, std::vector<Outerfunc_oii>(N_Type, nullptr));
+      cuOuter_ii = std::vector<std::vector<Outerfunc_oii>>(
+        N_Type, std::vector<Outerfunc_oii>(N_Type, nullptr));
 
       cuOuter_ii[Type.ComplexDouble][Type.ComplexDouble] = cuOuter_internal_cdtcd;
       cuOuter_ii[Type.ComplexDouble][Type.ComplexFloat] = cuOuter_internal_cdtcf;