diff --git a/slsReceiverSoftware/include/HDF5FileStatic.h b/slsReceiverSoftware/include/HDF5FileStatic.h
index b22b29543..29c24e730 100644
--- a/slsReceiverSoftware/include/HDF5FileStatic.h
+++ b/slsReceiverSoftware/include/HDF5FileStatic.h
@@ -512,7 +512,7 @@ public:
 
 		//hyperslab
 		int numMajorHyperslab = (numf-1)/maxFramesPerFile;
-		if ((numf-1)%maxFramesPerFile) numMajorHyperslab++;
+		if (((numf-1)%maxFramesPerFile) || (numf == 1)) numMajorHyperslab++;
 		bool error = false;
 		uint64_t framesSaved = 0;
 		for (int j = 0; j < numMajorHyperslab; j++) {