diff --git a/Project.toml b/Project.toml
index 8a20d5cd..55758812 100644
--- a/Project.toml
+++ b/Project.toml
@@ -1,7 +1,7 @@
 name = "WriteVTK"
 uuid = "64499a7a-5c06-52f2-abe2-ccb03c286192"
 authors = ["Juan Ignacio Polanco <juan-ignacio.polanco@cnrs.fr>"]
-version = "1.18.0"
+version = "1.18.1"
 
 [deps]
 Base64 = "2a0f44e3-6c83-55bd-87e4-b1978d98bd5f"
diff --git a/src/write_data.jl b/src/write_data.jl
index 26a30e5f..a9dfc9fb 100644
--- a/src/write_data.jl
+++ b/src/write_data.jl
@@ -67,6 +67,7 @@ guess_data_location(data::Tuple, args...) =
     guess_data_location(first(data), args...)
 
 guess_data_location(data::Tuple{}, args...) = VTKPointData()
+guess_data_location(data::AbstractString, args...) = VTKFieldData()  # a single string is always field data
 
 # Return the VTK string representation of a numerical data type.
 function datatype_str(::Type{T}) where {T <: VTKDataType}
diff --git a/test/checksums.sha1 b/test/checksums.sha1
index 8e85a9f6..c0862816 100644
--- a/test/checksums.sha1
+++ b/test/checksums.sha1
@@ -20,7 +20,7 @@ d6b447652cbfdbae70a389d5d0cdc825d9ef4ce6  multiblock_4_kmax.vtu
 e5e396469b59d25c970ec67172f70fed82fa810d  rectilinear_2D.vtr
 18e7e3793ec552d60e3f689d4631d48d2f98f9c0  rectilinear_3D.vtr
 9e82744afa51ece188c8819349cd206183e9216d  imagedata.vti
-f9915492cb2a02daa807ed8e23c754349aae8eaf  imagedata_2D.vti
+380430ce33fd6e4f22cd28382ff359eb07b0ea54  imagedata_2D.vti
 1e79d437255388e3bb38cf997c83960f90724296  imagedata_LinRange_2D.vti
 d117834ade2c49f0b789287f97c63d87aedff160  imagedata_StepRangeLen_2D.vti
 8e3ce81c0e22074483e6c3fdc371031c779400df  imagedata_LinRange.vti
diff --git a/test/imagedata.jl b/test/imagedata.jl
index 54a5db82..09757cfd 100644
--- a/test/imagedata.jl
+++ b/test/imagedata.jl
@@ -64,6 +64,12 @@ function main()
         vtk["p_values"] = p[:, :, 1]
         vtk["myVector"] = vec[:, :, :, 1]
         vtk["myCellData"] = cdata[:, :, 1]
+        # Pass string whose length is equal to the number of points.
+        # The idea is to make sure it's written as field data and not point data.
+        n = Ni * Nj
+        str = String(('0' + 1):('0' + n))
+        @assert length(str) == n
+        vtk["string"] = str
     end
 
     append!(outfiles, outfiles_2D)