diff --git a/src/mpi_distributed/data_generator.cpp b/src/mpi_distributed/data_generator.cpp
index 50d6aa2f..ba3a7fed 100644
--- a/src/mpi_distributed/data_generator.cpp
+++ b/src/mpi_distributed/data_generator.cpp
@@ -939,7 +939,7 @@ void* loadXY_DataGen(DG_Data* DG, int buffer_index, int ds_ptr) {
         }
         n_read = fread(bytesX, sizeof (unsigned char), DG->n_sizeX, DG->fpX);
          */
-        n_read = pread(fileno(DG->fpX), bytesX, DG->n_sizeX*sizeof (unsigned char), posX);
+        n_read = (int) pread(fileno(DG->fpX), bytesX, DG->n_sizeX*sizeof (unsigned char), posX);
     } else {
 #ifdef cMPI
         MPICHECK(MPI_File_seek(DG->mfpX, posX, MPI_SEEK_SET));
@@ -979,7 +979,7 @@ void* loadXY_DataGen(DG_Data* DG, int buffer_index, int ds_ptr) {
         if (err)
             msg("Error fseek ", __func__);
         n_read = fread(bytesY, sizeof (unsigned char), DG->n_sizeY, DG->fpY); */
-        n_read = pread(fileno(DG->fpY), bytesY, DG->n_sizeY*sizeof (float), posY);         
+        n_read = (int) pread(fileno(DG->fpY), bytesY, DG->n_sizeY*sizeof (unsigned char), posY);         
     } else {
 #ifdef cMPI
         MPICHECK(MPI_File_seek(DG->mfpY, posY, MPI_SEEK_SET));
@@ -1072,7 +1072,7 @@ void* loadXY_DataGen_float(DG_Data* DG, int buffer_index, int ds_ptr) {
             msg("Error fseek ", __func__);
         }
         n_read = fread(bytesX, sizeof (float), DG->n_sizeX, DG->fpX); */
-        n_read = pread(fileno(DG->fpX), bytesX, DG->n_sizeX*sizeof (float), posX);
+        n_read = (int) pread(fileno(DG->fpX), bytesX, DG->n_sizeX*sizeof (float), posX);
     } else {
 #ifdef cMPI
         MPICHECK(MPI_File_seek(DG->mfpX, posX, MPI_SEEK_SET));
@@ -1082,7 +1082,7 @@ void* loadXY_DataGen_float(DG_Data* DG, int buffer_index, int ds_ptr) {
     }
 
     //if (n_read != DG->n_sizeX) {
-    if (n_read != DG->n_sizeX*sizeof (float)) {
+    if (n_read != DG->n_sizeX*sizeof(float)) {
         printf("%s n_read %d n_size %d\n", __func__, n_read, DG->n_sizeX);
         msg("Error freadX ", __func__);
     }
@@ -1112,7 +1112,7 @@ void* loadXY_DataGen_float(DG_Data* DG, int buffer_index, int ds_ptr) {
         if (err)
             msg("Error fseek ", __func__);
         n_read = fread(bytesY, sizeof (float), DG->n_sizeY, DG->fpY); */
-        n_read = pread(fileno(DG->fpY), bytesY, DG->n_sizeY*sizeof (float), posY);
+        n_read = (int) pread(fileno(DG->fpY), bytesY, DG->n_sizeY*sizeof (float), posY);
     } else {
 #ifdef cMPI
         MPICHECK(MPI_File_seek(DG->mfpY, posY, MPI_SEEK_SET));