diff --git a/block/src/raw_async.rs b/block/src/raw_async.rs
index 152e5fa3b..8544040f5 100644
--- a/block/src/raw_async.rs
+++ b/block/src/raw_async.rs
@@ -7,6 +7,7 @@ use std::io::{Error, Seek, SeekFrom};
 use std::os::unix::io::{AsRawFd, RawFd};
 
 use io_uring::{IoUring, opcode, types};
+use libc::{FALLOC_FL_KEEP_SIZE, FALLOC_FL_PUNCH_HOLE, FALLOC_FL_ZERO_RANGE};
 use log::warn;
 use vmm_sys_util::eventfd::EventFd;
 
@@ -268,8 +269,6 @@ impl AsyncIo for RawFileAsync {
     fn punch_hole(&mut self, offset: u64, length: u64, user_data: u64) -> AsyncIoResult<()> {
         let (submitter, mut sq, _) = self.io_uring.split();
 
-        const FALLOC_FL_PUNCH_HOLE: i32 = 0x02;
-        const FALLOC_FL_KEEP_SIZE: i32 = 0x01;
         let mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
 
         // SAFETY: The file descriptor is known to be valid.
@@ -295,8 +294,6 @@ impl AsyncIo for RawFileAsync {
     fn write_zeroes(&mut self, offset: u64, length: u64, user_data: u64) -> AsyncIoResult<()> {
         let (submitter, mut sq, _) = self.io_uring.split();
 
-        const FALLOC_FL_ZERO_RANGE: i32 = 0x10;
-        const FALLOC_FL_KEEP_SIZE: i32 = 0x01;
         let mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE;
 
         // SAFETY: The file descriptor is known to be valid.
diff --git a/block/src/raw_async_aio.rs b/block/src/raw_async_aio.rs
index 7f66ce411..f59e463b4 100644
--- a/block/src/raw_async_aio.rs
+++ b/block/src/raw_async_aio.rs
@@ -10,6 +10,7 @@ use std::fs::File;
 use std::io::{Seek, SeekFrom};
 use std::os::unix::io::{AsRawFd, RawFd};
 
+use libc::{FALLOC_FL_KEEP_SIZE, FALLOC_FL_PUNCH_HOLE, FALLOC_FL_ZERO_RANGE};
 use log::warn;
 use vmm_sys_util::aio;
 use vmm_sys_util::eventfd::EventFd;
@@ -189,8 +190,6 @@ impl AsyncIo for RawFileAsyncAio {
         // Linux AIO has no IOCB command for fallocate, so perform the operation
         // synchronously and signal completion via the completion list, matching
         // the pattern used by the sync backend (RawFileSync).
-        const FALLOC_FL_PUNCH_HOLE: i32 = 0x02;
-        const FALLOC_FL_KEEP_SIZE: i32 = 0x01;
         let mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
 
         // SAFETY: FFI call with valid arguments
@@ -216,8 +215,6 @@ impl AsyncIo for RawFileAsyncAio {
         // Linux AIO has no IOCB command for fallocate, so perform the operation
         // synchronously and signal completion via the completion list, matching
         // the pattern used by the sync backend (RawFileSync).
-        const FALLOC_FL_ZERO_RANGE: i32 = 0x10;
-        const FALLOC_FL_KEEP_SIZE: i32 = 0x01;
         let mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE;
 
         // SAFETY: FFI call with valid arguments
diff --git a/block/src/raw_sync.rs b/block/src/raw_sync.rs
index 0e60a48a7..b9f89dde0 100644
--- a/block/src/raw_sync.rs
+++ b/block/src/raw_sync.rs
@@ -7,6 +7,7 @@ use std::fs::File;
 use std::io::{Seek, SeekFrom};
 use std::os::unix::io::{AsRawFd, RawFd};
 
+use libc::{FALLOC_FL_KEEP_SIZE, FALLOC_FL_PUNCH_HOLE, FALLOC_FL_ZERO_RANGE};
 use log::warn;
 use vmm_sys_util::eventfd::EventFd;
 
@@ -161,8 +162,6 @@ impl AsyncIo for RawFileSync {
     }
 
     fn punch_hole(&mut self, offset: u64, length: u64, user_data: u64) -> AsyncIoResult<()> {
-        const FALLOC_FL_PUNCH_HOLE: i32 = 0x02;
-        const FALLOC_FL_KEEP_SIZE: i32 = 0x01;
         let mode = FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE;
 
         // SAFETY: FFI call with valid arguments
@@ -185,8 +184,6 @@ impl AsyncIo for RawFileSync {
     }
 
     fn write_zeroes(&mut self, offset: u64, length: u64, user_data: u64) -> AsyncIoResult<()> {
-        const FALLOC_FL_ZERO_RANGE: i32 = 0x10;
-        const FALLOC_FL_KEEP_SIZE: i32 = 0x01;
         let mode = FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE;
 
         // SAFETY: FFI call with valid arguments