diff --git a/EC.jl b/EC.jl
index b4c76db..692f282 100644
--- a/EC.jl
+++ b/EC.jl
@@ -1,5 +1,5 @@
 using SparseArrays, LinearAlgebra, Arpack, Plots
-include("helper.jl")
+include("common.jl")
 
 "EC model for a Hamiltonian family H(c) = H0 + c * H1"
 mutable struct affine_EC
diff --git a/berggren_3body_resonance.jl b/berggren_3body_resonance.jl
index e8221cc..41b2eb8 100644
--- a/berggren_3body_resonance.jl
+++ b/berggren_3body_resonance.jl
@@ -1,5 +1,5 @@
 using LinearAlgebra, SparseArrays, Arpack
-include("helper.jl")
+include("common.jl")
 include("p_space.jl")
 include("ho_basis.jl")
 include("berggren.jl")
diff --git a/calculations/B2R_Berggren_poles.jl b/calculations/B2R_Berggren_poles.jl
index ba6967a..9a7577d 100644
--- a/calculations/B2R_Berggren_poles.jl
+++ b/calculations/B2R_Berggren_poles.jl
@@ -1,5 +1,5 @@
 include("../EC.jl")
-include("../helper.jl")
+include("../common.jl")
 include("../p_space.jl")
 
 # contour
diff --git a/calculations/B2R_comparison.jl b/calculations/B2R_comparison.jl
index f063fab..9df4254 100644
--- a/calculations/B2R_comparison.jl
+++ b/calculations/B2R_comparison.jl
@@ -1,5 +1,5 @@
 include("../EC.jl")
-include("../helper.jl")
+include("../common.jl")
 include("../p_space.jl")
 
 berggren_mesh = get_mesh([0, 0.4 - 0.15im, 0.8, 6], [128, 128, 128])
diff --git a/calculations/R2R_Berggren.jl b/calculations/R2R_Berggren.jl
index dc21130..c96cfc5 100644
--- a/calculations/R2R_Berggren.jl
+++ b/calculations/R2R_Berggren.jl
@@ -1,5 +1,5 @@
 include("../EC.jl")
-include("../helper.jl")
+include("../common.jl")
 include("../p_space.jl")
 
 # contour
diff --git a/calculations/R2R_Berggren_poles.jl b/calculations/R2R_Berggren_poles.jl
index 9e3afdd..9c9d436 100644
--- a/calculations/R2R_Berggren_poles.jl
+++ b/calculations/R2R_Berggren_poles.jl
@@ -1,5 +1,5 @@
 include("../EC.jl")
-include("../helper.jl")
+include("../common.jl")
 include("../p_space.jl")
 
 # contour
diff --git a/helper.jl b/common.jl
similarity index 100%
rename from helper.jl
rename to common.jl
diff --git a/ho_basis.jl b/ho_basis.jl
index f624815..7d7219c 100644
--- a/ho_basis.jl
+++ b/ho_basis.jl
@@ -1,7 +1,7 @@
 using SparseArrays
 using QuadGK
 using LRUCache
-include("helper.jl")
+include("common.jl")
 include("math.jl")
 
 "1-body HO basis"
diff --git a/math.jl b/math.jl
index f4a6208..a199365 100644
--- a/math.jl
+++ b/math.jl
@@ -1,5 +1,5 @@
 using SpecialFunctions, WignerSymbols
-include("helper.jl")
+include("common.jl")
 
 # Gaussian potentials in HO space
 inv_factorial(n) = Iterators.prod(inv.(1:n))
diff --git a/p_space_2body.jl b/p_space_2body.jl
index 95017be..5380eed 100644
--- a/p_space_2body.jl
+++ b/p_space_2body.jl
@@ -1,5 +1,5 @@
 using SparseArrays, Arpack
-include("helper.jl")
+include("common.jl")
 include("p_space.jl")
 
 E_target = -0.3919
diff --git a/p_space_3body.jl b/p_space_3body.jl
index f92eccc..760fcdc 100644
--- a/p_space_3body.jl
+++ b/p_space_3body.jl
@@ -1,5 +1,5 @@
 using LinearAlgebra, SparseArrays, Arpack
-include("helper.jl")
+include("common.jl")
 include("p_space.jl")
 include("ho_basis.jl")
 
diff --git a/p_space_3body_resonance.jl b/p_space_3body_resonance.jl
index b595855..1a34b92 100644
--- a/p_space_3body_resonance.jl
+++ b/p_space_3body_resonance.jl
@@ -1,5 +1,5 @@
 using LinearAlgebra, SparseArrays, Arpack
-include("helper.jl")
+include("common.jl")
 include("p_space.jl")
 include("ho_basis.jl")
 
diff --git a/test/misc.jl b/test/misc.jl
index 9329e2e..54835f3 100644
--- a/test/misc.jl
+++ b/test/misc.jl
@@ -1,5 +1,5 @@
 using SparseArrays, LinearAlgebra
-include("../helper.jl")
+include("../common.jl")
 
 #### gram_schmidt ####
  
diff --git a/test/p_space_basic.jl b/test/p_space_basic.jl
index 86d1481..1d9f764 100644
--- a/test/p_space_basic.jl
+++ b/test/p_space_basic.jl
@@ -1,5 +1,5 @@
 using Plots
-include("../helper.jl")
+include("../common.jl")
 include("../p_space.jl")
 
 vertices = [0, 1 - 0.5im, 2, 6]
diff --git a/test/simple_berggren.jl b/test/simple_berggren.jl
index 32bbb62..41b0450 100644
--- a/test/simple_berggren.jl
+++ b/test/simple_berggren.jl
@@ -1,5 +1,5 @@
 using Plots
-include("../helper.jl")
+include("../common.jl")
 include("../p_space.jl")
 
 vertices = [0, 0.5 - 0.3im, 1, 6]