diff --git a/features/filesystem/bd/ChainingBlockDevice.cpp b/features/filesystem/bd/ChainingBlockDevice.cpp
index 9dcfbae562..f9f5c9a29f 100644
--- a/features/filesystem/bd/ChainingBlockDevice.cpp
+++ b/features/filesystem/bd/ChainingBlockDevice.cpp
@@ -109,7 +109,7 @@ int ChainingBlockDevice::read(void *b, bd_addr_t addr, bd_size_t size)
             size -= read;
         }
 
-        addr -= size;
+        addr -= bdsize;
     }
 
     return 0;
@@ -140,7 +140,7 @@ int ChainingBlockDevice::program(const void *b, bd_addr_t addr, bd_size_t size)
             size -= program;
         }
 
-        addr -= size;
+        addr -= bdsize;
     }
 
     return 0;
@@ -169,7 +169,7 @@ int ChainingBlockDevice::erase(bd_addr_t addr, bd_size_t size)
             size -= erase;
         }
 
-        addr -= size;
+        addr -= bdsize;
     }
 
     return 0;