diff --git a/RELEASE.txt b/RELEASE.txt
index 7eff077d3..82453290b 100755
--- a/RELEASE.txt
+++ b/RELEASE.txt
@@ -57,6 +57,7 @@ This document describes the differences between v7.0.0 and v6.x.x
 - ctb: can set names for all the dacs
 - fpga/kernel programming, checks if drive is a special file and not a normal file
 - gotthard 25 um image reconstructed in gui and virtual hdf5 (firmware updated for slave to reverse channels)
+- fixed bug introduced in 6.0.0: hdf5 files created 1 file per frame after the initial file which had maxframesperfile
 
 2. Resolved Issues
 ==================
diff --git a/slsReceiverSoftware/src/BinaryDataFile.cpp b/slsReceiverSoftware/src/BinaryDataFile.cpp
index d93fbc46c..99bf2e42e 100644
--- a/slsReceiverSoftware/src/BinaryDataFile.cpp
+++ b/slsReceiverSoftware/src/BinaryDataFile.cpp
@@ -72,7 +72,7 @@ void BinaryDataFile::WriteToFile(char *buffer, const int buffersize,
         ++subFileIndex_;
         CreateFile();
     }
-    numFramesInFile_++;
+    ++numFramesInFile_;
 
     // write to file
     int ret = 0;
diff --git a/slsReceiverSoftware/src/HDF5DataFile.cpp b/slsReceiverSoftware/src/HDF5DataFile.cpp
index 0ffe0d525..e9b2c9212 100644
--- a/slsReceiverSoftware/src/HDF5DataFile.cpp
+++ b/slsReceiverSoftware/src/HDF5DataFile.cpp
@@ -128,7 +128,7 @@ void HDF5DataFile::CreateFirstHDF5DataFile(
 }
 
 void HDF5DataFile::CreateFile() {
-
+    numFramesInFile_ = 0;
     numFilesInAcquisition_++;
 
     std::ostringstream os;
@@ -237,7 +237,7 @@ void HDF5DataFile::WriteToFile(char *buffer, const int buffersize,
         ++subFileIndex_;
         CreateFile();
     }
-    numFramesInFile_++;
+    ++numFramesInFile_;
 
     // extend dataset (when receiver start followed by many status starts
     // (jungfrau)))