diff --git a/cpukit/dev/flash/flashdev.c b/cpukit/dev/flash/flashdev.c
index 4f00a17cdc..e6db844554 100644
--- a/cpukit/dev/flash/flashdev.c
+++ b/cpukit/dev/flash/flashdev.c
@@ -328,7 +328,7 @@ static int rtems_flashdev_check_offset_region(
 )
 {
   if ( ( rtems_flashdev_is_region_defined( iop ) ) &&
-       ( offset > rtems_flashdev_get_region_size( flash, iop ) ) ) {
+       ( offset > (int64_t) rtems_flashdev_get_region_size( flash, iop ) ) ) {
     rtems_set_errno_and_return_minus_one( EINVAL );
   }
   return 0;
@@ -506,7 +506,7 @@ static off_t rtems_flashdev_lseek(
   }
 
   if ( ( rtems_flashdev_is_region_defined(iop) ) &&
-       ( tmp_offset > rtems_flashdev_get_region_size( flash, iop ) ) ) {
+       ( tmp_offset > (int64_t) rtems_flashdev_get_region_size( flash, iop ) ) ) {
     rtems_set_errno_and_return_minus_one( EINVAL );
   }
 
diff --git a/cpukit/dev/i2c/eeprom.c b/cpukit/dev/i2c/eeprom.c
index 7b8f81a311..839d465e46 100644
--- a/cpukit/dev/i2c/eeprom.c
+++ b/cpukit/dev/i2c/eeprom.c
@@ -92,7 +92,7 @@ static ssize_t eeprom_read(
     return 0;
   }
 
-  if (n > avail) {
+  if (n > (size_t) avail) {
     n = (size_t) avail;
   }
 
@@ -154,7 +154,7 @@ static ssize_t eeprom_write(
     return 0;
   }
 
-  if (n > avail) {
+  if (n > (size_t) avail) {
     n = (size_t) avail;
   }
 
diff --git a/cpukit/dev/i2c/fpga-i2c-slave.c b/cpukit/dev/i2c/fpga-i2c-slave.c
index 9bad862366..42caa1a151 100644
--- a/cpukit/dev/i2c/fpga-i2c-slave.c
+++ b/cpukit/dev/i2c/fpga-i2c-slave.c
@@ -55,7 +55,7 @@ fpga_i2c_slave_read(i2c_dev* base, void* buf, size_t n, off_t offset)
     return 0;
   }
 
-  if (n > avail) {
+  if ((int64_t)n > avail) {
     n = (size_t) avail;
   }
 
@@ -97,7 +97,7 @@ fpga_i2c_slave_write(i2c_dev* base, const void* buf, size_t n, off_t offset)
     return 0;
   }
 
-  if (n > avail) {
+  if ((int64_t)n > avail) {
     n = (size_t) avail;
   }