diff --git a/examples/cube/cube_periodic_lexico.json b/examples/cube/cube_periodic_lexico.json
new file mode 100644
index 000000000..b8f207b70
--- /dev/null
+++ b/examples/cube/cube_periodic_lexico.json
@@ -0,0 +1,68 @@
+{
+  "Problem":
+  {
+    "Type": "Electrostatic",
+    "Verbose": 2,
+    "Output": "postpro"
+  },
+  "Model":
+  {
+    "Mesh": "mesh/cube_lexico.mesh",
+    "L0": 1.0e-2  // cm
+  },
+  "Domains":
+  {
+    "Materials":
+    [
+      {
+        "Attributes": [1],
+        "Permittivity": 1.0
+      }
+    ]
+  },
+  "Boundaries":
+  {
+    "Periodic":
+    [
+      {
+        "DonorAttributes": [3],
+        "ReceiverAttributes": [5],
+        "Direction": "X",
+        "Distance": 1.0e-2 // in L0 units
+      },
+      {
+        "DonorAttributes": [2],
+        "ReceiverAttributes": [4],
+        "Direction": "Y",
+        "Distance": 1.0e-2 // in L0 units
+      }
+    ],
+    "Terminal":
+    [
+      {
+        "Index": 1,
+        "Attributes": [1]
+      },
+      {
+        "Index": 2,
+        "Attributes": [6]
+      }
+    ]
+  },
+  "Solver":
+  {
+    "Order": 3,
+    "Device": "CPU",
+    "Electrostatic":
+    {
+      "Save": 2
+    },
+    "Linear":
+    {
+      "Type": "BoomerAMG",
+      "KSPType": "CG",
+      "Tol": 1.0e-8,
+      "MaxIts": 100
+    }
+  }
+}
diff --git a/examples/cube/mesh/cube_lexico.mesh b/examples/cube/mesh/cube_lexico.mesh
new file mode 100644
index 000000000..71def0cfd
--- /dev/null
+++ b/examples/cube/mesh/cube_lexico.mesh
@@ -0,0 +1,312 @@
+MFEM mesh v1.0
+
+#
+# MFEM Geometry Types (see fem/geom.hpp):
+#
+# POINT       = 0
+# SEGMENT     = 1
+# TRIANGLE    = 2
+# SQUARE      = 3
+# TETRAHEDRON = 4
+# CUBE        = 5
+# PRISM       = 6
+# PYRAMID     = 7
+#
+
+dimension
+3
+
+elements
+64
+1 5 0 1 6 5 25 26 31 30
+1 5 1 2 7 6 26 27 32 31
+1 5 2 3 8 7 27 28 33 32
+1 5 3 4 9 8 28 29 34 33
+1 5 5 6 11 10 30 31 36 35
+1 5 6 7 12 11 31 32 37 36
+1 5 7 8 13 12 32 33 38 37
+1 5 8 9 14 13 33 34 39 38
+1 5 10 11 16 15 35 36 41 40
+1 5 11 12 17 16 36 37 42 41
+1 5 12 13 18 17 37 38 43 42
+1 5 13 14 19 18 38 39 44 43
+1 5 15 16 21 20 40 41 46 45
+1 5 16 17 22 21 41 42 47 46
+1 5 17 18 23 22 42 43 48 47
+1 5 18 19 24 23 43 44 49 48
+1 5 25 26 31 30 50 51 56 55
+1 5 26 27 32 31 51 52 57 56
+1 5 27 28 33 32 52 53 58 57
+1 5 28 29 34 33 53 54 59 58
+1 5 30 31 36 35 55 56 61 60
+1 5 31 32 37 36 56 57 62 61
+1 5 32 33 38 37 57 58 63 62
+1 5 33 34 39 38 58 59 64 63
+1 5 35 36 41 40 60 61 66 65
+1 5 36 37 42 41 61 62 67 66
+1 5 37 38 43 42 62 63 68 67
+1 5 38 39 44 43 63 64 69 68
+1 5 40 41 46 45 65 66 71 70
+1 5 41 42 47 46 66 67 72 71
+1 5 42 43 48 47 67 68 73 72
+1 5 43 44 49 48 68 69 74 73
+1 5 50 51 56 55 75 76 81 80
+1 5 51 52 57 56 76 77 82 81
+1 5 52 53 58 57 77 78 83 82
+1 5 53 54 59 58 78 79 84 83
+1 5 55 56 61 60 80 81 86 85
+1 5 56 57 62 61 81 82 87 86
+1 5 57 58 63 62 82 83 88 87
+1 5 58 59 64 63 83 84 89 88
+1 5 60 61 66 65 85 86 91 90
+1 5 61 62 67 66 86 87 92 91
+1 5 62 63 68 67 87 88 93 92
+1 5 63 64 69 68 88 89 94 93
+1 5 65 66 71 70 90 91 96 95
+1 5 66 67 72 71 91 92 97 96
+1 5 67 68 73 72 92 93 98 97
+1 5 68 69 74 73 93 94 99 98
+1 5 75 76 81 80 100 101 106 105
+1 5 76 77 82 81 101 102 107 106
+1 5 77 78 83 82 102 103 108 107
+1 5 78 79 84 83 103 104 109 108
+1 5 80 81 86 85 105 106 111 110
+1 5 81 82 87 86 106 107 112 111
+1 5 82 83 88 87 107 108 113 112
+1 5 83 84 89 88 108 109 114 113
+1 5 85 86 91 90 110 111 116 115
+1 5 86 87 92 91 111 112 117 116
+1 5 87 88 93 92 112 113 118 117
+1 5 88 89 94 93 113 114 119 118
+1 5 90 91 96 95 115 116 121 120
+1 5 91 92 97 96 116 117 122 121
+1 5 92 93 98 97 117 118 123 122
+1 5 93 94 99 98 118 119 124 123
+
+boundary
+96
+1 3 0 5 6 1
+1 3 1 6 7 2
+1 3 2 7 8 3
+1 3 3 8 9 4
+1 3 5 10 11 6
+1 3 6 11 12 7
+1 3 7 12 13 8
+1 3 8 13 14 9
+1 3 10 15 16 11
+1 3 11 16 17 12
+1 3 12 17 18 13
+1 3 13 18 19 14
+1 3 15 20 21 16
+1 3 16 21 22 17
+1 3 17 22 23 18
+1 3 18 23 24 19
+6 3 100 101 106 105
+6 3 101 102 107 106
+6 3 102 103 108 107
+6 3 103 104 109 108
+6 3 105 106 111 110
+6 3 106 107 112 111
+6 3 107 108 113 112
+6 3 108 109 114 113
+6 3 110 111 116 115
+6 3 111 112 117 116
+6 3 112 113 118 117
+6 3 113 114 119 118
+6 3 115 116 121 120
+6 3 116 117 122 121
+6 3 117 118 123 122
+6 3 118 119 124 123
+5 3 0 25 30 5
+5 3 5 30 35 10
+5 3 10 35 40 15
+5 3 15 40 45 20
+5 3 25 50 55 30
+5 3 30 55 60 35
+5 3 35 60 65 40
+5 3 40 65 70 45
+5 3 50 75 80 55
+5 3 55 80 85 60
+5 3 60 85 90 65
+5 3 65 90 95 70
+5 3 75 100 105 80
+5 3 80 105 110 85
+5 3 85 110 115 90
+5 3 90 115 120 95
+3 3 4 9 34 29
+3 3 9 14 39 34
+3 3 14 19 44 39
+3 3 19 24 49 44
+3 3 29 34 59 54
+3 3 34 39 64 59
+3 3 39 44 69 64
+3 3 44 49 74 69
+3 3 54 59 84 79
+3 3 59 64 89 84
+3 3 64 69 94 89
+3 3 69 74 99 94
+3 3 79 84 109 104
+3 3 84 89 114 109
+3 3 89 94 119 114
+3 3 94 99 124 119
+2 3 0 1 26 25
+2 3 25 26 51 50
+2 3 50 51 76 75
+2 3 75 76 101 100
+2 3 1 2 27 26
+2 3 26 27 52 51
+2 3 51 52 77 76
+2 3 76 77 102 101
+2 3 2 3 28 27
+2 3 27 28 53 52
+2 3 52 53 78 77
+2 3 77 78 103 102
+2 3 3 4 29 28
+2 3 28 29 54 53
+2 3 53 54 79 78
+2 3 78 79 104 103
+4 3 20 45 46 21
+4 3 45 70 71 46
+4 3 70 95 96 71
+4 3 95 120 121 96
+4 3 21 46 47 22
+4 3 46 71 72 47
+4 3 71 96 97 72
+4 3 96 121 122 97
+4 3 22 47 48 23
+4 3 47 72 73 48
+4 3 72 97 98 73
+4 3 97 122 123 98
+4 3 23 48 49 24
+4 3 48 73 74 49
+4 3 73 98 99 74
+4 3 98 123 124 99
+
+vertices
+125
+3
+0 0 0
+0.25 0 0
+0.5 0 0
+0.75 0 0
+1 0 0
+0 0.25 0
+0.25 0.25 0
+0.5 0.25 0
+0.75 0.25 0
+1 0.25 0
+0 0.5 0
+0.25 0.5 0
+0.5 0.5 0
+0.75 0.5 0
+1 0.5 0
+0 0.75 0
+0.25 0.75 0
+0.5 0.75 0
+0.75 0.75 0
+1 0.75 0
+0 1 0
+0.25 1 0
+0.5 1 0
+0.75 1 0
+1 1 0
+0 0 0.25
+0.25 0 0.25
+0.5 0 0.25
+0.75 0 0.25
+1 0 0.25
+0 0.25 0.25
+0.25 0.25 0.25
+0.5 0.25 0.25
+0.75 0.25 0.25
+1 0.25 0.25
+0 0.5 0.25
+0.25 0.5 0.25
+0.5 0.5 0.25
+0.75 0.5 0.25
+1 0.5 0.25
+0 0.75 0.25
+0.25 0.75 0.25
+0.5 0.75 0.25
+0.75 0.75 0.25
+1 0.75 0.25
+0 1 0.25
+0.25 1 0.25
+0.5 1 0.25
+0.75 1 0.25
+1 1 0.25
+0 0 0.5
+0.25 0 0.5
+0.5 0 0.5
+0.75 0 0.5
+1 0 0.5
+0 0.25 0.5
+0.25 0.25 0.5
+0.5 0.25 0.5
+0.75 0.25 0.5
+1 0.25 0.5
+0 0.5 0.5
+0.25 0.5 0.5
+0.5 0.5 0.5
+0.75 0.5 0.5
+1 0.5 0.5
+0 0.75 0.5
+0.25 0.75 0.5
+0.5 0.75 0.5
+0.75 0.75 0.5
+1 0.75 0.5
+0 1 0.5
+0.25 1 0.5
+0.5 1 0.5
+0.75 1 0.5
+1 1 0.5
+0 0 0.75
+0.25 0 0.75
+0.5 0 0.75
+0.75 0 0.75
+1 0 0.75
+0 0.25 0.75
+0.25 0.25 0.75
+0.5 0.25 0.75
+0.75 0.25 0.75
+1 0.25 0.75
+0 0.5 0.75
+0.25 0.5 0.75
+0.5 0.5 0.75
+0.75 0.5 0.75
+1 0.5 0.75
+0 0.75 0.75
+0.25 0.75 0.75
+0.5 0.75 0.75
+0.75 0.75 0.75
+1 0.75 0.75
+0 1 0.75
+0.25 1 0.75
+0.5 1 0.75
+0.75 1 0.75
+1 1 0.75
+0 0 1
+0.25 0 1
+0.5 0 1
+0.75 0 1
+1 0 1
+0 0.25 1
+0.25 0.25 1
+0.5 0.25 1
+0.75 0.25 1
+1 0.25 1
+0 0.5 1
+0.25 0.5 1
+0.5 0.5 1
+0.75 0.5 1
+1 0.5 1
+0 0.75 1
+0.25 0.75 1
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+1 0.75 1
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+1 1 1
diff --git a/palace/fem/libceed/restriction.cpp b/palace/fem/libceed/restriction.cpp
index f63450aeb..03fac6ad8 100644
--- a/palace/fem/libceed/restriction.cpp
+++ b/palace/fem/libceed/restriction.cpp
@@ -22,6 +22,7 @@ void InitLexicoRestr(const mfem::FiniteElementSpace &fespace,
   const int P = fe.GetDof();
   const mfem::TensorBasisElement *tfe = dynamic_cast<const mfem::TensorBasisElement *>(&fe);
   const mfem::Array<int> &dof_map = tfe->GetDofMap();
+  const bool dof_map_is_identity = dof_map.Size() == 0;
   const CeedInt comp_stride =
       (fespace.GetVDim() == 1 || fespace.GetOrdering() == mfem::Ordering::byVDIM)
           ? 1
@@ -56,7 +57,7 @@ void InitLexicoRestr(const mfem::FiniteElementSpace &fespace,
                   "restriction.");
       for (int j = 0; j < P; j++)
       {
-        const int sdid = dof_map[j];  // signed
+        const int sdid = dof_map_is_identity ? j : dof_map[j];  // signed
         const int did = (sdid >= 0) ? sdid : -1 - sdid;
         const int sgid = dofs[did];  // signed
         const int gid = (sgid >= 0) ? sgid : -1 - sgid;
@@ -381,7 +382,7 @@ void InitRestriction(const mfem::FiniteElementSpace &fespace,
   }
   const mfem::TensorBasisElement *tfe = dynamic_cast<const mfem::TensorBasisElement *>(fe);
   const bool vector = fe->GetRangeType() == mfem::FiniteElement::VECTOR;
-  const bool lexico = (tfe && tfe->GetDofMap().Size() > 0 && !vector && !is_interp);
+  const bool lexico = (tfe && !vector && !is_interp);
   if (lexico)
   {
     // Lexicographic ordering using dof_map.