diff --git a/sim/mcuboot-sys/csupport/run.c b/sim/mcuboot-sys/csupport/run.c
index d355c6e..dd63d55 100644
--- a/sim/mcuboot-sys/csupport/run.c
+++ b/sim/mcuboot-sys/csupport/run.c
@@ -449,3 +449,8 @@
         }
     }
 }
+
+uint32_t boot_max_align(void)
+{
+    return BOOT_MAX_ALIGN;
+}
diff --git a/sim/mcuboot-sys/src/c.rs b/sim/mcuboot-sys/src/c.rs
index 6f92c34..3d2f3ea 100644
--- a/sim/mcuboot-sys/src/c.rs
+++ b/sim/mcuboot-sys/src/c.rs
@@ -45,7 +45,7 @@
 }
 
 pub fn boot_max_align() -> usize {
-    unsafe { raw::BOOT_MAX_ALIGN as usize }
+    unsafe { raw::boot_max_align() as usize }
 }
 
 pub fn rsa_oaep_encrypt(pubkey: &[u8], seckey: &[u8]) -> Result<[u8; 256], &'static str> {
@@ -84,7 +84,7 @@
         pub fn boot_trailer_sz(min_write_sz: u8) -> u32;
 
         pub static BOOT_MAGIC_SZ: u32;
-        pub static BOOT_MAX_ALIGN: u32;
+        pub fn boot_max_align() -> u32;
 
         pub fn rsa_oaep_encrypt_(pubkey: *const u8, pubkey_len: libc::c_uint,
                                  seckey: *const u8, seckey_len: libc::c_uint,