diff --git a/workspace_tools/targets.py b/workspace_tools/targets.py
index 6eb6bea5fd..6f25e0a480 100644
--- a/workspace_tools/targets.py
+++ b/workspace_tools/targets.py
@@ -734,6 +734,7 @@ class MTS_MDOT_F411RE(Target):
         part.close()
         outbin.seek(0, 0)
         data = outbin.read()
+        outbin.seek(0, 1)
         crc = struct.pack('<I', binascii.crc32(data) & 0xFFFFFFFF)
         outbin.write(crc)
         outbin.close()
@@ -774,6 +775,7 @@ class MTS_DRAGONFLY_F411RE(Target):
         part.close()
         outbin.seek(0, 0)
         data = outbin.read()
+        outbin.seek(0, 1)
         crc = struct.pack('<I', binascii.crc32(data) & 0xFFFFFFFF)
         outbin.write(crc)
         outbin.close()