diff --git a/sim/simflash/src/lib.rs b/sim/simflash/src/lib.rs
index 9523a4f..c628ec1 100644
--- a/sim/simflash/src/lib.rs
+++ b/sim/simflash/src/lib.rs
@@ -46,6 +46,7 @@
     fn sector_iter(&self) -> SectorIter;
     fn device_size(&self) -> usize;
 
+    fn align(&self) -> usize;
     fn erased_val(&self) -> u8;
 }
 
@@ -239,6 +240,10 @@
         self.data.len()
     }
 
+    fn align(&self) -> usize {
+        self.align
+    }
+
     fn erased_val(&self) -> u8 {
         self.erased_val
     }