diff --git a/Project.toml b/Project.toml
index 7d519912..2fada9b9 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "SparseDiffTools"
 uuid = "47a9eef4-7e08-11e9-0b38-333d64bd3804"
 authors = ["Pankaj Mishra <pankajmishra1511@gmail.com>", "Chris Rackauckas <contact@chrisrackauckas.com>"]
-version = "2.5.1"
+version = "2.5.2"
 
 [deps]
 ADTypes = "47edcb42-4c32-4615-8424-f2b9edc5f35b"
diff --git a/src/coloring/matrix2graph.jl b/src/coloring/matrix2graph.jl
index ef19ca19..fcf4050b 100644
--- a/src/coloring/matrix2graph.jl
+++ b/src/coloring/matrix2graph.jl
@@ -16,8 +16,7 @@ end
 """
     _rows_by_cols(rows_index,cols_index)
 
-Returns a vector of columns where each column contains
-a vector of its row indices.
+Returns a vector of columns where each column contains a vector of its row indices.
 """
 function _rows_by_cols(rows_index, cols_index)
     return _cols_by_rows(cols_index, rows_index)
@@ -26,15 +25,14 @@ end
 """
     matrix2graph(sparse_matrix, [partition_by_rows::Bool=true])
 
-A utility function to generate a graph from input
-sparse matrix, columns are represented with vertices
-and 2 vertices are connected with an edge only if
-the two columns are mutually orthogonal.
+A utility function to generate a graph from input sparse matrix, columns are represented
+with vertices and 2 vertices are connected with an edge only if the two columns are mutually
+orthogonal.
 
-Note that the sparsity pattern is defined by structural nonzeroes, ie includes
-explicitly stored zeros.
+Note that the sparsity pattern is defined by structural nonzeroes, ie includes explicitly
+stored zeros.
 """
-function matrix2graph(sparse_matrix::SparseMatrixCSC{<:Number, Int},
+function matrix2graph(sparse_matrix::AbstractSparseMatrix{<:Number},
     partition_by_rows::Bool = true)
     (rows_index, cols_index, _) = findnz(sparse_matrix)
 
@@ -43,7 +41,7 @@ function matrix2graph(sparse_matrix::SparseMatrixCSC{<:Number, Int},
 
     num_vtx = partition_by_rows ? nrows : ncols
 
-    inner = SimpleGraph(num_vtx)
+    inner = SimpleGraph{promote_type(eltype(rows_index), eltype(cols_index))}(num_vtx)
 
     if partition_by_rows
         rows_by_cols = _rows_by_cols(rows_index, cols_index)