diff --git a/MRIFiles/Project.toml b/MRIFiles/Project.toml
index a69bcbef..d3ecfe7a 100644
--- a/MRIFiles/Project.toml
+++ b/MRIFiles/Project.toml
@@ -1,7 +1,7 @@
 name = "MRIFiles"
 uuid = "5a6f062f-bf45-497d-b654-ad17aae2a530"
 author = ["Tobias Knopp <tobias@knoppweb.de>"]
-version = "0.3.1"
+version = "0.3.2"
 
 [deps]
 Printf = "de0858da-6303-5e67-8744-51eddeeeb8d7"
diff --git a/MRIFiles/src/ISMRMRD/HDF5Types.jl b/MRIFiles/src/ISMRMRD/HDF5Types.jl
index d4b9c27c..b5d43ccb 100644
--- a/MRIFiles/src/ISMRMRD/HDF5Types.jl
+++ b/MRIFiles/src/ISMRMRD/HDF5Types.jl
@@ -245,7 +245,7 @@ function writeProfiles(file, dataset, profiles::Vector{Profile})
     #for some reason this is stored as float
     d = HVL_T(2*length(profiles[l].data), pointer(reinterpret(Float32,profiles[l].data)))
 
-    iobuf = IOBuffer()
+    iobuf = IOBuffer(sizehint=ISMRMRD_HEADER_PLUS_POINTERS_SIZE)
     write(iobuf, profiles[l].head )
     write(iobuf, t )
     write(iobuf, d)